The crystal and molecular structure of some derivatives of NN′-ethylenebis(salicylaldehydeiminato)cobalt(III)

Monomeric metal hydroxides, alkoxides, and amides of the late transition metals: synthesis, reactions, and thermochemistry

“…For comparison, O-C bond distances of 1.43 A were found for diethyl ether and ethanol, and 1.39 A was noted for cobalt-complexed methanol. 70 This also seems to be the case for iridium (Table III)…”

“…In a related reaction with [(PMe3)4IrH(OH)]+, Milstein showed ^-ligand exchange of that material with D20 results in the rapid formation of [(PMe3)4IrH-(OD)]+, indicating that four-centered transition states (rather than reductive elimination-oxidative addition sequences) are viable mechanisms for these exchange reactions (eq 70). 39 [L4IrH(OH)]+ + excess D20 [L4IrH(OD)]+ + HOD (70) Homolytlc L" M-X (X = OR, OH, NR2) Bond Strengths The most significant aspect of near-unity equilibrium constants for reactions 65, 67, and 68 is that relative L"M-X (X = H, CR3, NR2j and OR) bond strengths may be estimated from these data. As outlined for eq 65,12 the near-unity value of this equilibrium constant shows the free energy of equilibrium is essentially zero.…”

Synthesis of New Ketonyl Palladium(II) and Platinum(II) Complexes with Nitrogen-Donor Ligands. Crystal Structure of [Pt{CH2C(O)Me}2(bpy)]

“…The few acetonyl complexes characterized by X-ray diffraction methods are of Mn, Co, − Au, ,, Rh, Hg, , and Tl. , No crystal structure of any acetonyl Pd or Pt complex is available so far. The only reported CH 2 C(O)R derivatives of Pd(II) or Pt(II) are trans -[Pd{CH 2 C(O)Ph}Cl(PPh 3 ) 2 ] and cis -[Pd 2 {μ-CH 2 C(O)Ph} 2 (PPh 3 ) 4 ] …”

Synthesis and Crystal Structure of Organocobalt(III) Complexes with Secondary Alkyls or Bulky Schiff Base Equatorial Ligands

“…Unlike the Co−C bond, the Co−L bond distance has a strong dependence on the natures of both the equatorial ligand and the R group. Previous data for octahedral salen complexes showed that the Co−N(py) bond distances ranged from 2.031 (R = CH 3 O) to 2.184 Å (R = i -C 4 H 9 ), , for saloph complexes from 2.098 (R = CH 2 CN) to 2.215 Å (R = C 2 H 5 ), and for cobaloxime, from 2.028 to 2.099 Å. ,,,, Therefore, the Co−N bonds are much longer in Schiff base complexes than in cobaloximes. At present, the largest Co−N bond distance of known B 12 models is found in our complex i -C 4 H 9 Co(salen)(γ-pic) (2.230(4) Å); the value reported here is the closest to that in coenzyme B 12 (2.24(1) Å) …”

“…Previous data for octahedral salen complexes showed that the Co-N(py) bond distances ranged from 2.031 (R ) CH 3 O) to 2.184 Å (R ) i-C 4 H 9 ), 5,9 for saloph complexes from 2.098 (R ) CH 2 CN) to 2.215 Å (R ) C 2 H 5 ), and for cobaloxime, from 2.028 to 2.099 Å. 5,10,14,19,20 Therefore, the Co-N bonds are much longer in Schiff base complexes than a Mean deviation from the equatorial plane of four donor atoms N1N2O1O2. b Torsion angles for N1N2O1O2.…”