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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/cm
3
)
Reactions:
[
Ref.1
,
Ref.2
]
Ir + 3F
2
→ IrF
6
Half-life:
164m
77
Ir = 70 μs ()
165m
77
Ir = 325 μs (p (87%), α (12%))
166
77
Ir = 10.5 ms (α (93%), p (7%))
166m
77
Ir = 15.1 ms (α (98.2%), p (1.8%))
167
77
Ir = 29.3 ms (α (43%), p (39.3%))
167m
77
Ir = 25.7 ms (α (90%), p (0.42%))
168
77
Ir = 230 ms (α (about 100%))
168m
77
Ir = 163 ms (α (77%))
169
77
Ir = 353 ms (α (53%))
169m
77
Ir = 280 ms (α (79%))
170
77
Ir = 910 ms ()
170m
77
Ir = 811 ms (α (36%))
171
77
Ir = 3.1 s (α (15%))
171m
77
Ir = 1.47 s (α (54%))
172
77
Ir = 4.4 s ()
172m
77
Ir = 2.19 s ()
173
77
Ir = 9.0 s (β
+
(> 93%), α (< 7%))
173m
77
Ir = 2.20 s (β
+
(88%), α (12%))
174
77
Ir = 7.9 s (β
+
(99.5%), α (0.5%))
174m
77
Ir = 4.9 s (β
+
(97.5%), α (2.5%))
175
77
Ir = 9 s (β
+
(99.15%), α (0.85%))
176
77
Ir = 8.7 s (β
+
(96.9%), α (3.1%))
177
77
Ir = 30 s (β
+
(about 100%), α (0.06%))
178
77
Ir = 12 s (β
+
(100%))
179
77
Ir = 79 s (β
+
(100%))
180
77
Ir = 1.5 min (β
+
(100%))
181
77
Ir = 4.90 min (β
+
(100%))
181m
77
Ir = 298 ns (internal transition (100%))
181n
77
Ir = 126 ns (internal transition (100%))
182
77
Ir = 15.0 min (β
+
(100%))
182m
77
Ir = 170 ns (internal transition (100%))
182n
77
Ir = 130 ns (internal transition (100%))
183
77
Ir = 58 min (β
+
(about 100%))
184
77
Ir = 3.09 h (β
+
(100%))
184m
77
Ir = 470 μs (internal transition (100%))
184n
77
Ir = 350 ns (internal transition (100%))
185
77
Ir = 14.4 hasа (β
+
(100%))
185m
77
Ir = 120 ns (internal transition (100%))
186
77
Ir = 16.64 hasа (β
+
(100%))
186m
77
Ir = 1.92 hasа (β
+
(about 75%), internal transition (about 25%))
187
77
Ir = 10.5 hasа (β
+
(100%))
187m
77
Ir = 30.3 ms (internal transition (100%))
187n
77
Ir = 152 ns (internal transition (100%))
187p
77
Ir = 1.8 μs (internal transition (100%))
188
77
Ir = 41.5 hasа (β
+
(100%))
188m
77
Ir = 4.2 ms (internal transition (about 100%))
189
77
Ir = 13.2 d (electron capture (100%))
189m
77
Ir = 13.3 ms (internal transition (100%))
189n
77
Ir = 3.7 ms (internal transition (100%))
190
77
Ir = 11.78 d (β
+
(100%))
190m
77
Ir = 1.120 hasа (internal transition (100%))
190p
77
Ir = 3.087 hasа (β
+
(91.4%), internal transition (8.6%))
191
77
Ir = stable ( (isotopic abundance 37,3%))
191m
77
Ir = 4.899 s (internal transition (100%))
191n
77
Ir = 5.7 s (internal transition (100%))
192
77
Ir = 73.830 d (β
-
(95.24%), electron capture (4.76%))
192m
77
Ir = 1.45 min (internal transition (about 100%), β
-
(0.0175%))
192n
77
Ir = 241 y (internal transition (100%))
193
77
Ir = stable ( (isotopic abundance 62,7%))
193m
77
Ir = 10.53 d (internal transition (100%))
193n
77
Ir = 124.8 μs (internal transition (100%))
194
77
Ir = 19.28 hasа (β
-
(100%))
194m
77
Ir = 31.85 ms (internal transition (100%))
194n
77
Ir = 171 день (β
-
(100%))
195
77
Ir = 2.29 hasа (β
-
(100%))
195m
77
Ir = 3.67 hasа (β
-
(95%), internal transition (5%))
195n
77
Ir = 4.4 μs (internal transition (100%))
196
77
Ir = 52 s (β
-
(100%))
196m
77
Ir = 1.40 hasа (β
-
(about 100%))
197
77
Ir = 5.8 min (β
-
(100%))
197m
77
Ir = 8.9 min (β
-
(about 100%), internal transition (0.25%))
197n
77
Ir = 30 μs (internal transition (100%))
198
77
Ir = 8 s (β
-
(100%))
199
77
Ir = 7 s ()
199m
77
Ir = 235 ns (internal transition (100%))
200
77
Ir = 43 s (β
-
(100%))
201
77
Ir = 21 s (β
-
(100%))
202
77
Ir = 11 s (β
-
(100%))
202m
77
Ir = 3.4 μs (internal transition (100%))
203m
77
Ir = 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:
Ir
3+
+ 3e
-
→ Ir, E = 1.15 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
0 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
0 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
35.48 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
25.1 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
26.4
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
612.5
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
670 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
193.5 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
20.8 (g)
References:
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 66 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 272-273 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
]
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