Abstract
The title compound, [Ni(C2H2N3)Cl]n, has been prepared by the hydrothermal reaction of nickel(II) chloride and 1,2,4-triazole. The nickel cation is coordinated in a slightly distorted tetrahedral environment, by one Cl atom and three N atoms from different triazolate ligands. The polymeric layer is formed by the triply bridging nature of the 1,2,4-triazolate bonded to three different Ni atoms through its three N atoms. The layer contains both binuclear units and tetranuclear cavities. In the binuclear unit, two Ni atoms are bridged by two nearly coplanar triazolate groups through the 1,2-positions, affording a six-membered ring around an inversion center. Each binuclear unit is further connected to four parallel units through the 4-positions of the triazolate groups. Four adjacent units, which are parallel in pairs, afford 16-membered tetranuclear cavities. In such a cavity, the two nearest-neighbor Ni atoms are bridged by a single triazolate group through the 1,4-positions.
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