Crosslinks vs. Coordination Pendant Groups

Empirical quantum-chemical predictions summarized above from classic inorganic chemistry and ligand field theory are correlated wifli macroscopic enhancements in the glass-transition temperature for Ni(II) complexes wifli poly(4-vinylpyridine). The 102°C enhancement in Tg of P4VP occurs when flie metal/pyridine-ligand concentration ratio is approximately 1 2 on a molar basis. It is postulated that thermal 

The crystal structure of undiluted nickel acetate tetrahydrate is pseudo-octahedral.  

Six-coordinate d nickel complexes are strongly favored from an equilibrium viewpoint when good donor ligands such as pyridine are present, even though the macromolecule-metal complex is completely amorphous. 

Nickel(II) and pyridine are classihed as a borderline acid-base pair, whereas lattice waters in the first shell of nickel acetate tetrahydrate are hard bases. 

Stronger metal-ligand o-bonding occurs when pyridines replace weak-base waters of hydration in the coordination sphere of Ni(II). 

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