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| Section2 = |Section3 = }} Cobalt tetracarbonyl hydride is the organometallic compound with the formula HCo(CO)4. It is a yellow liquid that forms a colorless vapor and has an intolerable odor. Its main use is as a catalyst in hydroformylation. ==Structure and properties== HCo(CO)4 is a trigonal bipyrimidal molecule. The hydride ligand occupies one of the axial positions, thus the symmetry of the molecule is C''3v''.〔 The Co-CO and Co-H bond distances were determined by gas-phase electron diffraction to be 1.764 and 1.556 Å, respectively. Assuming the presence of a formal hydride ion, the oxidation state of cobalt in this compound is +1. Like some other metal carbonyl hydrides, HCo(CO)4 is acidic, with a pKa of 8.5. HCo(CO)4 melts at -33 °C and above that temperature decomposes to Co2(CO)8 and H2.〔 It undergoes substitution by tertiary phosphines. For example, triphenylphosphine gives HCo(CO)3PPh3 and HCo(CO)2(PPh3)2. These derivatives are more stable than HCo(CO)4 and are used industrially.〔 These derivatives are generally less acidic than HCo(CO)4.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cobalt tetracarbonyl hydride」の詳細全文を読む スポンサード リンク
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