Carbonyl Ligand Lability in the μ-H[Cr(CO)5]2− Anion

Structural and chemical characterization of a phosphine bound M-H-M bridged carbonylate: Et4N+(.mu.-H)[Mo2(CO)9PPh3]-

“…156 (2) P-Mo(2) H( 16) 75(1) C(2)-Mo( 1) -H( 16) 93 (2) P-Mo(2)-C( 6) 94.9 The hydrogen atoms of the tetraethylammonium cation were not located. Unobserved reflections were not included, and unit weights were used at all stages.…”

“…Refinement of the positional and thermal parameters of the C(7)-Mo(2)-H( 16) 104 (1) C( 16)-P-Mo(2) 118. 3 (2) C(8)-Mo(2)-H( 16) 168 (1) C( 22)-P-Mo (2) 114.5 (2) C(9)-Mo(2)-H( 16)…”

A convenient synthesis of cis-Mo(CO)4L2 derivatives (L = Group 5a ligand) and a qualitative study of their thermal reactivity toward ligand dissociation

“…4 We have previously reported that benzyl isocyanide (BzNC) complexes of ferrous phthalocyanine are photochromic. 5 We have now investigated several macrocyclic complexes of iron including ferrous phthalocyanine5,6, ferrous 2,3,9,10-tetramethyl-1,4,8,11 -tetraazacyclotetradeca-1,3,8,10-tetraene (Fe(TIM)),7•8 and ferrous bis(dimethylglyoxime).9 All of these systems undergo a photochromic reaction based on the shift of the equilibrium…”

Ligand Substitution Processes on Carbonylmetal Derivatives. 3.1Reaction of Hydridopentacarbonylchromates with Phosphines

“…A similar observation has been mentioned by Darensbourg et al . We have verified independently that the monosubstituted complex Cr(CO) 5 PEt 3 did not afford significant amounts of 4 when reacted with 2 equiv of PEt 3 for 3 days in THF at 65 °C.

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“…Contrary to K + [HFe(CO) 4 ] - , which is stable in protic media, K + [HCr(CO) 5 ] - reacts with alcohols to generate the stable bridged dinuclear hydride K + (μ-H)[Cr(CO) 5 ] 2 - , 3 , with loss of molecular hydrogen. , Thus, only reactions of 2 in aprotic solvents have been considered. Reactions of (μ-H)[Cr(CO) 5 ] 2 - (Et 4 N + salt) with phosphines have been reported before , and will be discussed comparatively.…”