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Properties of substance:

iridium

Group of substances:

inorganic

Physical appearance:

cubic metal

Empirical formula (Hill's system for organic substances):

Ir

Structural formula as text:

Ir

Molar/atomic mass: 192.22

Melting point (°C):

2450

Boiling point (°C):

4380

Solubility (g/100 g of solvent):

mercury: insoluble [Ref.]
toluene: insoluble [Ref.]
water: insoluble [Ref.]

Numerical data:

Year of discovery: 1804
Superconducting temperature (K): 0.1

Density:

22.562 (20°C, g/cm3)

Reactions:

  1. [Ref.1, Ref.2aster]
    Ir + 3F2 → IrF6

Half-life:

164m77Ir = 70 μs ()
165m77Ir = 325 μs (p (87%), α (12%))
16677Ir = 10.5 ms (α (93%), p (7%))
166m77Ir = 15.1 ms (α (98.2%), p (1.8%))
16777Ir = 29.3 ms (α (43%), p (39.3%))
167m77Ir = 25.7 ms (α (90%), p (0.42%))
16877Ir = 230 ms (α (about 100%))
168m77Ir = 163 ms (α (77%))
16977Ir = 353 ms (α (53%))
169m77Ir = 280 ms (α (79%))
17077Ir = 910 ms ()
170m77Ir = 811 ms (α (36%))
17177Ir = 3.1 s (α (15%))
171m77Ir = 1.47 s (α (54%))
17277Ir = 4.4 s ()
172m77Ir = 2.19 s ()
17377Ir = 9.0 s (β+ (> 93%), α (< 7%))
173m77Ir = 2.20 s (β+ (88%), α (12%))
17477Ir = 7.9 s (β+ (99.5%), α (0.5%))
174m77Ir = 4.9 s (β+ (97.5%), α (2.5%))
17577Ir = 9 s (β+ (99.15%), α (0.85%))
17677Ir = 8.7 s (β+ (96.9%), α (3.1%))
17777Ir = 30 s (β+ (about 100%), α (0.06%))
17877Ir = 12 s (β+ (100%))
17977Ir = 79 s (β+ (100%))
18077Ir = 1.5 min (β+ (100%))
18177Ir = 4.90 min (β+ (100%))
181m77Ir = 298 ns (internal transition (100%))
181n77Ir = 126 ns (internal transition (100%))
18277Ir = 15.0 min (β+ (100%))
182m77Ir = 170 ns (internal transition (100%))
182n77Ir = 130 ns (internal transition (100%))
18377Ir = 58 min (β+ (about 100%))
18477Ir = 3.09 h (β+ (100%))
184m77Ir = 470 μs (internal transition (100%))
184n77Ir = 350 ns (internal transition (100%))
18577Ir = 14.4 hasа (β+ (100%))
185m77Ir = 120 ns (internal transition (100%))
18677Ir = 16.64 hasа (β+ (100%))
186m77Ir = 1.92 hasа (β+ (about 75%), internal transition (about 25%))
18777Ir = 10.5 hasа (β+ (100%))
187m77Ir = 30.3 ms (internal transition (100%))
187n77Ir = 152 ns (internal transition (100%))
187p77Ir = 1.8 μs (internal transition (100%))
18877Ir = 41.5 hasа (β+ (100%))
188m77Ir = 4.2 ms (internal transition (about 100%))
18977Ir = 13.2 d (electron capture (100%))
189m77Ir = 13.3 ms (internal transition (100%))
189n77Ir = 3.7 ms (internal transition (100%))
19077Ir = 11.78 d (β+ (100%))
190m77Ir = 1.120 hasа (internal transition (100%))
190p77Ir = 3.087 hasа (β+ (91.4%), internal transition (8.6%))
19177Ir = stable ( (isotopic abundance 37,3%))
191m77Ir = 4.899 s (internal transition (100%))
191n77Ir = 5.7 s (internal transition (100%))
19277Ir = 73.830 d (β- (95.24%), electron capture (4.76%))
192m77Ir = 1.45 min (internal transition (about 100%), β- (0.0175%))
192n77Ir = 241 y (internal transition (100%))
19377Ir = stable ( (isotopic abundance 62,7%))
193m77Ir = 10.53 d (internal transition (100%))
193n77Ir = 124.8 μs (internal transition (100%))
19477Ir = 19.28 hasа (β- (100%))
194m77Ir = 31.85 ms (internal transition (100%))
194n77Ir = 171 день (β- (100%))
19577Ir = 2.29 hasа (β- (100%))
195m77Ir = 3.67 hasа (β- (95%), internal transition (5%))
195n77Ir = 4.4 μs (internal transition (100%))
19677Ir = 52 s (β- (100%))
196m77Ir = 1.40 hasа (β- (about 100%))
19777Ir = 5.8 min (β- (100%))
197m77Ir = 8.9 min (β- (about 100%), internal transition (0.25%))
197n77Ir = 30 μs (internal transition (100%))
19877Ir = 8 s (β- (100%))
19977Ir = 7 s ()
199m77Ir = 235 ns (internal transition (100%))
20077Ir = 43 s (β- (100%))
20177Ir = 21 s (β- (100%))
20277Ir = 11 s (β- (100%))
202m77Ir = 3.4 μs (internal transition (100%))
203m77Ir = 798 ns (internal transition (100%))

Vapour pressure (Torr):

0.01 (2297°C)
0.1 (2525°C)
1 (2810°C)
10 (3160°C)
100 (3625°C)

Electrode potential:

Ir3+ + 3e- → Ir, E = 1.15 V (water, 25°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

0 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

0 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

35.48 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

25.1 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

26.4

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

612.5

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

670 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

193.5 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

20.8 (g)

References:

  1. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 66 [Russian]
  3. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 272-273 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru