Osmium compounds

Oxidation states of osmium
−2 Na
2[Os(CO)
4]
−1 Na
2[Os
4(CO)
13]
0 Os
3(CO)
12
+1 OsI
+2 OsI
2
+3 OsBr
3
+4 OsO
2, OsCl
4
+5 OsF
5
+6 OsF
6
+7 OsOF
5
+8 OsO
4, Os(NCH
3)
4

Osmium compounds are compounds containing the element osmium (Os). Osmium forms compounds with oxidation states ranging from −2 to +8. The most common oxidation states are +2, +3, +4, and +8. The +8 oxidation state is notable for being the highest attained by any chemical element aside from iridium's +9[1] and is encountered only in xenon,[2][3] ruthenium,[4] hassium,[5] iridium,[6] and plutonium.[7][8] The oxidation states −1 and −2 represented by the two reactive compounds Na
2[Os
4(CO)
13] and Na
2[Os(CO)
4] are used in the synthesis of osmium cluster compounds.[9][10]

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