Inorganic and organometallic cobaloximes with dioxime containing Se side chain: Synthesis, characterization and comparison with related B12 model compounds

Effect of chalcogens on CO insertion into the palladium–methyl bond of [(N^N^X)Pd(CH3)]+ (X = O, S, Se) and on CO/ethylene copolymerisation

“…Both PhO − and PhS − salts were generated from the reactions of phenol or thiophenol with K 2 CO 3 and NaOH respectively; but PhSeNa was obtained from the reduction of PhSeSePh with NaBH 4 in ethanol according to a literature procedure. 48,49 Compounds L1-L5 are potential N pz ^Npy ^X (X = O, S, Se) tridentate ligands that can also bind as either N py ^X or N py ^Npz bidentate ligands. Therefore, the substitution reaction of [Pd(Cl)(CH 3 )(COD)] with these ligands resulted in either the neutral palladium(II) complex [Pd(N py ^Npz )(CH 3 )Cl] (type I) or the neutral palladium(II) complexes [Pd(N py ^X)(CH 3 )Cl] (type II) (Scheme 2).…”

Isonicotinate-Zn(ii)/Cd(ii) bridged dicobaloximes: synthesis, characterization and electrocatalytic proton reduction studies

“…pseudo-octahedral cobalt complexes of glyoximato equatorial ligands and two trans-axial ligands have been extensively studied and showed hydrogen evolution at relatively lower overpotential. [13][14][15][16][17][18][19][20] Initially, cobaloximes were synthesized and studied to mimic the Vitamin B 12 chemistry, [21][22][23][24][25][26][27][28][29][30][31][32][33][34] but due to their rich coordination chemistry, these have been utilized in many catalytic reactions as well as in organic synthesis. [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] In the present time, cobaloxime complexes have been identified as one of the most active series of molecular catalysts for electrocatalytic and photocatalytic hydrogen production because of their low cost, easy synthesis and tuning of catalytic properties by changing the substituents in the equatorial and/or axial ligands.…”