Tetrakis(3-cyanopyridine)diisothiocyanatonickel(II) and its clathrates with EtOH and CH2Cl2: structures, thermal stabilities and enthalpies of guest release

The structures of the alpha -host complex, Ni(NCS)(2) (3-cyanopyridine)(4), 1, and its clathrates with EtOH, 2, and CH2Cl2, 3, have been elucidated. T he enthalpies of the guest release reaction have been determined by applyin g the Clausius-Clapeyron equation to the guest vapour pressure vs. temperat ure data for the thermal decomposition of the solid inclusion compounds. XR PD and thermal analysis studies show the sorption-desorption process 1<->3, and the guest exchange reactions 2<->3, to be fully reversible.