Abstract
The 1:2 condensation of o-phenelenediamine and o-vanilline yields a compartmental N 2O 4 ligand N, N′-(1,2-Phenylene)-bis(3-methoxysalicylideneimine) [H 2L]. When nickel(II) thiocyanate is added to the methanol solution of H 2L, followed by addition of ammonium thiocyanate, an unusual nickel(II) compound, [NH 4(NiL) 2SCN]·H 2O ( 1), is separated out in which an ammonium ion is sandwiched between two neutral square planner NiL moieties. Hydrogen bonding interactions are observed among the ammonium ion, NiL moieties, the thiocyanate anion and the water of crystallization. The compound is characterized by C, H, N analysis, UV–VIS and IR spectroscopy, room temperature magnetic susceptibility measurement and X-ray crystal diffraction study. The compound crystallizes in monoclinic space group P2 1/ n with a = 13.8636(7) Å, b = 14.0267(7) Å, c = 22.2715(10) Å and β = 94.301(3)°.
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