Diaquacobalt Tetracyanonickelate Tetrahydrate

On the crystal chemistry of inorganic nitrides: crystal-chemical parameters, bonding behavior, and opportunities in the exploration of their compositional space

“…In comparison, both [6] Cr 2+ and [6] Co 2+ are dominatingly high spin in oxides, 58 making [6] Cr 2+ strongly JT-active (with clear-cut bi-modal bond-length distribution) and [6] Co 2+ weakly JT-active (unimodal bond-length distribution). It is possible that the observation of regular Co 2+ /Cr 2+ N 6 octahedra is due to the dynamic JTE, which was shown to be present in Co 2+ N 6 terpyridine complexes by Kremer et al 149 In oxynitride Co 2+ (H 2 O) 2 Ni 2+ (CN) 4 ·4H 2 O (59366; spin unknown), 150 bond distances are 2 × 2.095 and 2 × 2.101 Å to N 3− , and 2 × 2.128 Å to O 2− (0.380, 0.376 and 0.319 v.u. respectively); in Cs 2 Co 2+ (S 8 (Re 3+ (CN)) 6 )(H 2 O) 2 (89491), 151 bond distances are 2.052 (0.390) and 2.092 (0.351) to O 2− , and 4 × 2.161 Å (0.332 v.u.)…”

Two-dimensional double metal cyanide complexes: highly active catalysts for the homopolymerization of propylene oxide and copolymerization of propylene oxide and carbon dioxide

“…H 2 O molecules are coordinated to Co via O(3), while H 2 O molecules loosely interact with Pd via O(1), which is evidenced by a 0.08 A distortion of Pd from square planar geometry toward O(1). H 2 O molecules containing O(2) and O(4) are hydrogen bound to other H 2 O molecules, but not to metal centers (Fig.2).Jacobson and co-workers have shown using TGA that H 2 O loss occurs in three distinct steps 20. The hydrogen bound H 2 O molecules are lost first, then the Pd-bound H2 O, followed by the H 2 O molecules coordinated to Co. Interestingly, when PO is combined with catalytic amounts of Co(H 2 O) 2 [Ni(CN) 4 ]•4H 2 O in the hydrated, partially dehydrated and anhydrous forms, polymer is only formed with the anhydrous form (Co[Ni(CN) 4 ]).…”

Co-Ni Cyanide Bi-Metal Catalysts: Copolymerization of Carbon Dioxide with Propylene Oxide and Chain Transfer Agents

“…Thermogravimetry (TG) and derivative thermogravimetry (DTG) curves for the three catalysts are shown in Figures 1 and 2. Co-Ni(0) started to decompose at temperatures greater than 400 • C. Before that, it lost about 0.3 wt.%, which should be associated with the removal of water molecules, with approximately 0.1 wt.% (from ≈70 • C to ≈140 • C) accounting for water molecules interacting with the metal centers [47]. The rest of the water (0.2 wt.%) might be related to the exposure of the material to the atmosphere during the sample preparation.…”