Iridium (Ir) | AMERICAN ELEMENTS ®

About Iridium

Platinum first came to Europe in the form of platina, grey metallic crumbs that were unusable to metalworkers in their native form. When platina is dissolved in aqua regia, a mixture of strong acids, a dark insoluble residue is left behind. An English chemist named Smithson Tennant was the first to experiment extensively on large quantities of this residue, eventually convincing himself and announcing to the world in 1804 that it contained two new elements: osmium and iridium. While osmium was named for the pungent odor produced by its oxide, iridium was notable for the many vibrant colors of its salts, leading Tennant to derive its name from Iris, the Greek goddess of rainbows.

All of the platinum group metals are known for being hard, fairly non-reactive, and performing well under high-temperatures, but iridium stands out in these regards even within this small family. It is the most corrosion-resistant of all metals, is extremely hard, and has an extremely high melting temperature--2466 degrees Celsius. While iridium metal’s resistance to change is extremely desirable in some applications, the tradeoff is that solid iridium is too hard and brittle to work or machine and melts at too high a temperature to make traditional casting practical.

The limited options for techniques to work with iridium significantly limit applications of the pure metal, but the one of the few that exist drives much of the demand for the element. The primary use of pure iridium is in crucibles for procedures that must be carried out under extremely high-temperatures. Most notably, these crucibles are essential for the production of many high-purity single-crystal materials, including semiconductors, garnets used in lasers and industrial welding, synthetic sapphire for electronics applications, silicate crystals used in sensors, and lithium crystals used in electronics.

Other uses of pure iridium include encapsulation of the plutonium-238 fuel in radioisotope thermoelectric generators of unmanned spacecraft, the production of antiprotons for particle physics experiments, and the production of mirrors used in x-ray optics applications. Additionally, radioisotopes of iridium are used for gamma-radiography for testing of metals, as well as for some forms of medical radiotherapy.

Most other applications of iridium use it combination with other elements. In alloys, it imparts increased hardness and resistance to corrosion and heat. These alloys are used in a range of applications where the material chosen must withstand substantial wear from use or extreme environmental conditions. Historically, iridium alloys were sought after for fountain pen tips and components of cannons that suffered from significant wear, while modern uses include electrical contacts for spark plugs, microelectrodes for use in electrophysiology, and extremely resilient aircraft engine parts. A platinum-iridium alloy was also used to construct the international prototype meter and kilogram mass in 1889, and the kilogram prototype is still in use as the international standard for mass. Iridium compounds are frequently used in research and industry as chemical catalysts.

Like other platinum group metals, iridium is typically obtained for commercial use as a byproduct from nickel and copper mining and processing, but can also be obtained from ores rich in platinum and from alluvial deposits.

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Iridium is the second-most dense element (after osmium) and the most corrosion resistant metal known, making it the shiniest precious metal. Iridium is alloyed with platinum to produce highly corrosion resistant electrical contacts for spark plugs. To learn more about Iridium, click on the About tab. Iridium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. Iridium nanoparticles and nanopowders are also available. Iridium oxide is available in powder and dense pellet form for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Iridium fluoride is another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Iridium is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

Iridium Properties

Iridium(Ir) atomic and molecular weight, atomic number and elemental symbol Iridium is a Block D, Group 9, Period 6 element. The number of electrons in each of iridium's shells is 2, 8, 18, 32, 15, 2 and its electron configuration is [Xe] 4f¹⁴ 5d⁷ 6s². Elemental Iridium The iridium atom has a radius of 135.7.pm and its Van der Waals radius is 202.pm. Iridium Bohr Model . Iridium metal is found alone and in alloys with other platinum group metals. Iridium was first discovered by Smithson Tennant in 1803. Iridium's name is derived from the Greek goddess Iris, personification of the rainbow, on account of the striking and diverse colors of its salts.

General Properties

Symbol:	Ir
Atomic Number:	77
Atomic Weight:	192.217
Element Category:	transition metal
Group, Period, Block:	9, 6, d
Color:	silvery white/ silvery-white
Other Names:	Iridio

Physical Properties

Melting Point:	2466 °C, 4471 °F, 2739 K
Boiling Point:	4428 °C, 8002 °F, 4701 K
Density:	22.56 g/cm³
Liquid Density @ Melting Point:	19 g/cm³
Density @ 20°C:	22.56 g/cm³
Density of Solid:	22650 kg·m³
Specific Heat:	0.13 (kJ/kg K)
Superconductivity Temperature:	0.11 [or -273.04 °C (-459.47 °F)] K
Triple Point:	N/A
Critical Point:	N/A
Heat of Fusion (kJ·mol^-1):	26.4
Heat of Vaporization (kJ·mol^-1):	612.1
Heat of Atomization (kJ·mol^-1):	664.34
Thermal Conductivity:	147 W·m^-1·K^-1
Thermal Expansion:	6.4 µm/(m·K)
Electrical Resistivity:	(20 °C) 47.1 nΩ·m
Tensile Strength:	N/A
Molar Heat Capacity:	25.10 J·mol^-1·K^-1
Young's Modulus:	528 GPa
Shear Modulus:	210 GPa
Bulk Modulus:	320 GPa
Poisson Ratio:	0.26
Mohs Hardness:	6.5
Vickers Hardness:	1760 MPa
Brinell Hardness:	1670 MPa
Speed of Sound:	(20 °C) 4825 m·s^-1
Pauling Electronegativity:	2.2
Sanderson Electronegativity:	N/A
Allred Rochow Electronegativity:	1.55
Mulliken-Jaffe Electronegativity:	N/A
Allen Electronegativity:	N/A
Pauling Electropositivity:	1.8
Reflectivity (%):	78
Refractive Index:	N/A

Chemical Properties

Electrons:	77
Protons:	77
Neutrons:	115
Electron Configuration:	[Xe] 4f¹⁴ 5d⁷ 6s²
Atomic Radius:	136 pm
Atomic Radius, non-bonded (Å):	2.13
Covalent Radius:	141±6 pm
Covalent Radius (Å):	1.32
Van der Waals Radius:	202 pm
Oxidation States:	3,1, 0, 1, 2, 3, 4, 5, 6
Phase:	Solid
Crystal Structure:	face-centered cubic
Magnetic Ordering:	paramagnetic
Electron Affinity (kJ·mol^-1)	111.537
1^st Ionization Energy:	880 kJ·mol^-1
2^nd Ionization Energy:	1600 kJ·mol^-1
3^rd Ionization Energy:	N/A

Identifiers

CAS Number:	7439-88-5
EC Number:	231-095-9
MDL Number:	MFCD00011062
Beilstein Number:	N/A
SMILES Identifier:	[Ir]
InChI Identifier:	InChI=1S/Ir
InChI Key:	GKOZUEZYRPOHIO-UHFFFAOYSA-N
PubChem CID:	23924
ChemSpider ID:	22367

Abundance

Earth - Total:	840 ppb
Mercury - Total:	650 ppb
Venus - Total:	890 ppb
Earth - Seawater (Oceans), ppb by weight:	N/A
Earth - Seawater (Oceans), ppb by atoms:	N/A
Earth - Crust (Crustal Rocks), ppb by weight:	0.4
Earth - Crust (Crustal Rocks), ppb by atoms:	0.05
Sun - Total, ppb by weight:	2
Sun - Total, ppb by atoms:	0.01
Stream, ppb by weight:	N/A
Stream, ppb by atoms:	N/A
Meterorite (Carbonaceous), ppb by weight:	550
Meterorite (Carbonaceous), ppb by atoms:	60
Typical Human Body, ppb by weight:	N/A
Typical Human Body, ppb by atom:	N/A
Universe, ppb by weight:	2
Universe, ppb by atom:	0.01

History

Discovered By:	Smithson Tennant
Discovery Date:	1803
First Isolation:	Smithson Tennant (1803)

Health, Safety & Transportation Information for Iridium

Iridium nontoxic in its elemental form; however, safety data for Iridium and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the Products tab. The below information applies to elemental (metallic) Iridium.

Safety Data
Signal Word	Danger
Hazard Statements	H228-H319
Hazard Codes	F,Xi
Risk Codes	11-36
Safety Precautions	16-26
RTECS Number	N/A
Transport Information	UN 3089 4.1/PG 2
WGK Germany	3
Globally Harmonized System of Classification and Labelling (GHS)

Review and Print SDS for Iridium Metal

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SAFETY DATA SHEET

Date Created: 05/15/2015

Date Revised: 05/15/2015

SECTION 1. IDENTIFICATION

Product Name: Iridium Metal

Product Number: All applicable American Elements product codes, e.g. IR-M-02, IR-M-03, IR-M-04, IR-M-05

CAS #: 7439-88-5

Relevant identified uses of the substance: Scientific research and development

Supplier details:
American Elements
1093 Broxton Ave. Suite 2000
Los Angeles, CA 90024
Tel: +1 310-208-0551
Fax: +1 310-208-0351

Emergency telephone number:
Domestic, North America +1 800-424-9300
International +1 703-527-3887

SECTION 2. HAZARDS IDENTIFICATION

Classification of the substance or mixture
Classification according to Regulation (EC) No 1272/2008
The substance is not classified as hazardous to health or the environment according to the CLP regulation.
Classification according to Directive 67/548/EEC or Directive 1999/45/EC
Not applicable
Information concerning particular hazards for human and environment:
No information known.
Hazards not otherwise classified
No information known.
Label elements
Labelling according to Regulation (EC) No 1272/2008
Not applicable
Hazard pictograms
Not applicable
Signal word
Not applicable
Hazard statements
Not applicable
WHMIS classification
Not controlled
Classification system
HMIS ratings (scale 0-4)
(Hazardous Materials Identification System)
HEALTH
FIRE
REACTIVITY
0
0
0
Health (acute effects) = 0
Flammability = 0
Physical Hazard = 0
Other hazards
Results of PBT and vPvB assessment
PBT:
Not applicable.
vPvB:
Not applicable.

SECTION 3. COMPOSITION/INFORMATION ON INGREDIENTS

Chemical characterization: Substances
CAS# Description:
7439-88-5 Iridium
Identification number(s):
EC number:
231-095-9

SECTION 4. FIRST AID MEASURES

Description of first aid measures
General information
No special measures required.
After inhalation
Seek medical treatment in case of complaints.
After skin contact
Generally the product does not irritate the skin.
After eye contact
Rinse opened eye for several minutes under running water. If symptoms persist, consult a doctor.
After swallowing
If symptoms persist consult doctor.
Information for doctor
Most important symptoms and effects, both acute and delayed
No further relevant information available.
Indication of any immediate medical attention and special treatment needed
No further relevant information available.

SECTION 5. FIREFIGHTING MEASURES

Extinguishing media
Suitable extinguishing agents
Special powder for metal fires. Do not use water.
For safety reasons unsuitable extinguishing agents
Water
Special hazards arising from the substance or mixture
If this product is involved in a fire, the following can be released:
Metal oxide fume
Advice for firefighters
Protective equipment:
No special measures required.

SECTION 6. ACCIDENTAL RELEASE MEASURES

Personal precautions, protective equipment and emergency procedures
Not required.
Environmental precautions:
Do not allow material to be released to the environment without proper governmental permits.
Do not allow product to reach sewage system or any water course.
Do not allow to penetrate the ground/soil.
Methods and material for containment and cleaning up:
Pick up mechanically.
Prevention of secondary hazards:
No special measures required.
Reference to other sections
See Section 7 for information on safe handling
See Section 8 for information on personal protection equipment.
See Section 13 for disposal information.

SECTION 7. HANDLING AND STORAGE

Handling
Precautions for safe handling
Keep container tightly sealed.
Store in cool, dry place in tightly closed containers.
Information about protection against explosions and fires:
No special measures required.
Conditions for safe storage, including any incompatibilities
Storage
Requirements to be met by storerooms and receptacles:
No special requirements.
Information about storage in one common storage facility:
Not required.
Further information about storage conditions:
Keep container tightly sealed.
Store in cool, dry conditions in well sealed containers.
Specific end use(s)
No further relevant information available.

SECTION 8. EXPOSURE CONTROLS/PERSONAL PROTECTION

Additional information about design of technical systems:
No further data; see section 7.
Control parameters
Components with limit values that require monitoring at the workplace:
The product does not contain any relevant quantities of materials with critical values
that have to be monitored at the workplace.
Additional information:
No data
Exposure controls
Personal protective equipment
General protective and hygienic measures
The usual precautionary measures for handling chemicals should be followed.
Maintain an ergonomically appropriate working environment.
Breathing equipment:
Not required.
Protection of hands:
Not required.
Penetration time of glove material (in minutes)
Not determined
Eye protection:
Safety glasses
Body protection:
Protective work clothing.

SECTION 9. PHYSICAL AND CHEMICAL PROPERTIES

Information on basic physical and chemical properties
General Information
Appearance:
Form: Solid in various forms
Odor: Not determined
Odor threshold: Not determined.
pH-value: Not applicable.
Change in condition
Melting point/Melting range: 2450 °C (4442 °F)
Boiling point/Boiling range: 4428 °C (8002 °F)
Sublimation temperature / start: Not determined
Flammability (solid, gaseous)
Not determined.
Ignition temperature: Not determined
Decomposition temperature: Not determined
Auto igniting: Not determined.
Danger of explosion: Product does not present an explosion hazard.
Explosion limits:
Lower: Not determined
Upper: Not determined
Vapor pressure: Not applicable.
Density at 20 °C (68 °F): 22.65 g/cm³ (189.014 lbs/gal)
Relative density
Not determined.
Vapor density
Not applicable.
Evaporation rate
Not applicable.
Solubility in / Miscibility with Water: Not determined
Partition coefficient (n-octanol/water): Not determined.
Viscosity:
dynamic: Not applicable.
kinematic: Not applicable.
Other information
No further relevant information available.

SECTION 10. STABILITY AND REACTIVITY

Reactivity
No information known.
Chemical stability
Stable under recommended storage conditions.
Thermal decomposition / conditions to be avoided:
Decomposition will not occur if used and stored according to specifications.
Possibility of hazardous reactions
No dangerous reactions known
Conditions to avoid
No further relevant information available.
Incompatible materials:
No information known.
Hazardous decomposition products:
Metal oxide fume

SECTION 11. TOXICOLOGICAL INFORMATION

Information on toxicological effects
Acute toxicity:
No effects known.
LD/LC50 values that are relevant for classification:
No data
Skin irritation or corrosion:
Powder: irritant effect
Eye irritation or corrosion:
Powder: irritant effect
Sensitization:
No sensitizing effects known.
Germ cell mutagenicity:
No effects known.
Carcinogenicity:
No classification data on carcinogenic properties of this material is available from the EPA, IARC, NTP, OSHA or ACGIH.
Reproductive toxicity:
No effects known.
Specific target organ system toxicity - repeated exposure:
No effects known.
Specific target organ system toxicity - single exposure:
No effects known.
Aspiration hazard:
No effects known.
Subacute to chronic toxicity:
No effects known.
Additional toxicological information:
To the best of our knowledge the acute and chronic toxicity of this substance is not fully known.

SECTION 12. ECOLOGICAL INFORMATION

Toxicity
Aquatic toxicity:
No further relevant information available.
Persistence and degradability
No further relevant information available.
Bioaccumulative potential
No further relevant information available.
Mobility in soil
No further relevant information available.
Additional ecological information:
General notes:
Do not allow material to be released to the environment without proper governmental permits.
Do not allow undiluted product or large quantities to reach ground water, water course or sewage system.
Avoid transfer into the environment.
Results of PBT and vPvB assessment
PBT:
Not applicable.
vPvB:
Not applicable.
Other adverse effects
No further relevant information available.

SECTION 13. DISPOSAL CONSIDERATIONS

Waste treatment methods
Recommendation
Consult state, local or national regulations to ensure proper disposal.
Uncleaned packagings:
Recommendation:
Disposal must be made according to official regulations.

SECTION 14. TRANSPORT INFORMATION

UN-Number
DOT, ADN, IMDG, IATA
Not applicable
UN proper shipping name
DOT, ADN, IMDG, IATA
Not applicable
Transport hazard class(es)
DOT, ADR, ADN, IMDG, IATA
Class
Not applicable
Packing group
DOT, IMDG, IATA
Not applicable
Environmental hazards: Not applicable.
Special precautions for user
Not applicable.
Transport in bulk according to Annex II of MARPOL73/78 and the IBC Code
Not applicable.
Transport/Additional information: DOT
Marine Pollutant (DOT): No

SECTION 15. REGULATORY INFORMATION

Safety, health and environmental regulations/legislation specific for the substance or mixture
National regulations
All components of this product are listed in the U.S. Environmental Protection Agency Toxic Substances Control Act Chemical substance Inventory.
All components of this product are listed on the Canadian Domestic Substances List (DSL).
SARA Section 313 (specific toxic chemical listings)
Substance is not listed.
California Proposition 65
Prop 65 - Chemicals known to cause cancer
Substance is not listed.
Prop 65 - Developmental toxicity
Substance is not listed.
Prop 65 - Developmental toxicity, female
Substance is not listed.
Prop 65 - Developmental toxicity, male
Substance is not listed.
Information about limitation of use:
For use only by technically qualified individuals.
Other regulations, limitations and prohibitive regulations
Substance of Very High Concern (SVHC) according to the REACH Regulations (EC) No. 1907/2006.
Substance is not listed.
The conditions of restrictions according to Article 67 and Annex XVII of the Regulation (EC) No 1907/2006 (REACH) for the manufacturing, placing on the market and use must be observed.
Substance is not listed.
Annex XIV of the REACH Regulations (requiring Authorisation for use)
Substance is not listed.
REACH - Pre-registered substances
Substance is listed.
Chemical safety assessment:
A Chemical Safety Assessment has not been carried out.

16. OTHER INFORMATION

Safety Data Sheet according to Regulation (EC) No. 1907/2006 (REACH). The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. American Elements shall not be held liable for any damage resulting from handling or from contact with the above product. See reverse side of invoice or packing slip for additional terms and conditions of sale. COPYRIGHT 1997-2016 AMERICAN ELEMENTS. LICENSED GRANTED TO MAKE UNLIMITED PAPER COPIES FOR INTERNAL USE ONLY.

Iridium Isotopes

There are two natural isotopes of iridium (Ir): ¹⁹¹Ir and ¹⁹³Ir.

Nuclide	Isotopic Mass	Half-Life	Mode of Decay	Nuclear Spin	Magnetic Moment	Binding Energy (MeV)	Natural Abundance (% by atom)
¹⁶⁴Ir	163.99220(44)#	1# ms	Unknown	2-#	N/A	1247.83	-
¹⁶⁵Ir	164.98752(23)#	<1# µs	p to ¹⁶⁴Os	1/2+#	N/A	1265.22	-
¹⁶⁶Ir	165.98582(22)#	10.5(22) ms	a to ¹⁶¹Re; p to ¹⁶⁴Os	(2-)	N/A	1273.3	-
¹⁶⁷Ir	166.981665(20)	35.2(20) ms	a to ¹⁶³Re; p to ¹⁶⁶Os; ß⁺ to ¹⁹⁷Os	1/2+	N/A	1281.38	-
¹⁶⁸Ir	167.97988(16)#	161(21) ms	a to ¹⁶⁴Re; ß⁺ to ¹⁶⁸Os	high	N/A	1298.77	-
¹⁶⁹Ir	168.976295(28)	780(360) ms [0.64(+46-24) s]	a to ¹⁶⁶Re; ß⁺ to ¹⁶⁹Os	1/2+#	N/A	1306.85	-
¹⁷⁰Ir	169.97497(11)#	910(150) ms [0.87(+18-12) s]	ß⁺ to ¹⁷⁰Os; a to ¹⁶⁶Re	low#	N/A	1314.93	-
¹⁷¹Ir	170.97163(4)	3.6(10) s [3.2(+13-7) s]	a to ¹⁷¹Re; ß⁺ to ¹⁶⁷Os	1/2+#	N/A	1323.01	-
¹⁷²Ir	171.97046(11)#	4.4(3) s	ß⁺ to ¹⁷²Os; a to ¹⁶⁸Re	(3+)	N/A	1331.09	-
¹⁷³Ir	172.967502(15)	9.0(8) s	ß⁺ to ¹⁷³Os; a to ¹⁶⁹Re	(3/2+,5/2+)	N/A	1348.48	-
¹⁷⁴Ir	173.966861(30)	7.9(6) s	ß⁺ to ¹⁷⁴Os; a to ¹⁷⁰Re	(3+)	N/A	1356.56	-
¹⁷⁵Ir	174.964113(21)	9(2) s	ß⁺ to ¹⁷⁵Os; a to ¹⁷¹Re	(5/2-)	N/A	1364.64	-
¹⁷⁶Ir	175.963649(22)	8.3(6) s	ß⁺ to ¹⁷⁶Os; a to ¹⁷²Re	N/A	N/A	1372.72	-
¹⁷⁷Ir	176.961302(21)	30(2) s	ß⁺ to ¹⁷⁷Os; a to ¹⁷³Re	5/2-	N/A	1380.8	-
¹⁷⁸Ir	177.961082(21)	12(2) s	ß⁺ to ¹⁷⁸Os	N/A	N/A	1388.88	-
¹⁷⁹Ir	178.959122(12)	79(1) s	ß⁺ to ¹⁷⁹Os	(5/2)-	N/A	1406.27	-
¹⁸⁰Ir	179.959229(23)	1.5(1) min	ß⁺ to ¹⁸⁰Os	(4,5)(+#)	N/A	1414.35	-
¹⁸¹Ir	180.957625(28)	4.90(15) min	ß⁺ to ¹⁸¹Os	(5/2)-	N/A	1422.43	-
¹⁸²Ir	181.958076(23)	15(1) min	ß⁺ to ¹⁸²Os	(3+)	N/A	1430.51	-
¹⁸³Ir	182.956846(27)	57(4) min	ß⁺ to ¹⁸³Os; a to ¹⁷⁹Re	5/2-	N/A	1438.59	-
¹⁸⁴Ir	183.95748(3)	3.09(3) h	ß⁺ to ¹⁸⁴Os	5-	N/A	1446.66	-
¹⁸⁵Ir	184.95670(3)	14.4(1) h	ß⁺ to ¹⁸⁵Os	5/2-	N/A	1454.74	-
¹⁸⁶Ir	185.957946(18)	16.64(3) h	ß⁺ to ¹⁸⁶Os	5+	N/A	1462.82	-
¹⁸⁷Ir	186.957363(7)	10.5(3) h	ß⁺ to ¹⁸⁷Os	3/2+	N/A	1470.9	-
¹⁸⁸Ir	187.958853(8)	41.5(5) h	EC to ¹⁸⁸Os	1-	0.3	1478.98	-
¹⁸⁹Ir	188.958719(14)	13.2(1) d	EC to ¹⁸⁹Os	3/2+	0.13	1487.06	-
¹⁹⁰Ir	189.9605460(18)	11.78(10) d	EC to ¹⁹⁰Os	4-	0.04	1485.82	-
¹⁹¹Ir	190.9605940(18)	Observationally Stable	-	3/2+	0.1462	1493.9	37.3
¹⁹²Ir	191.9626050(18)	73.827(13) d	ß^- to ¹⁹²Pt	4+	1.92	1501.98	-
¹⁹³Ir	192.9629264(18)	Observationally Stable	-	3/2+	0.1592	1510.06	62.7
¹⁹⁴Ir	193.9650784(18)	19.28(13) h	ß^- to ¹⁹⁴Pt	1-	N/A	1518.14	-
¹⁹⁵Ir	194.9659796(18)	2.5(2) h	ß^- to ¹⁹⁵Pt	3/2+	N/A	1526.21	-
¹⁹⁶Ir	195.96840(4)	52(1) s	ß^- to ¹⁹⁶Pt	(0-)	N/A	1534.29	-
¹⁹⁷Ir	196.969653(22)	5.8(5) min	ß^- to ¹⁹⁷Pt	3/2+	N/A	1542.37	-
¹⁹⁸Ir	197.97228(21)#	8(1) s	ß^- to ¹⁹⁸Pt	N/A	N/A	1541.13	-
¹⁹⁹Ir	198.97380(4)	20# s	ß^- to ¹⁹⁹Pt	3/2+#	N/A	1549.21	-