Syntheses, crystal structures and coordination compounds of some 2-hetarylcyanoximes
2-hetarylcyanoximes which have the general formula HO–NC(CN)–R, where R is a heterocyclic group such as 2-pyridyl, 2-quinolyl, 2-benzthiazolyl etc., have been found to be good multidentate ligands for coordination chemistry. They form intensely colored complexes with iron(II) and bis-compounds with copper(I), which are used in analytical chemistry. Stability constants for anionic Fe2+ tris-cyanoximates were determined. The detailed syntheses and crystal structures of 2-pyridilcyanoxime (HPCO), 2-quinolylcyanoxime (HQCO) and 2-thiazolylcyanoxime (HTLCO) are reported. Molecules of HPCO in the crystal state adopt a non-planar cis–anti conformation. HQCO crystallizes as a monohydrate and this cyanoxime has a trans–anti non-planar conformation in the solid state. Molecules of HTLCO showed a trans–syn planar conformation in the solid state. Crystal structures of other known cyanoxime ligands are reviewed, as well as syntheses and the coordination modes for 2-hetarylcyanoximes in various complexes with s-, p- and d-metals.
crystal structures, transition metal complexes, cyanoxime complexes
Mokhir, A. A., K. V. Domasevich, N. Kent Dalley, Xiaolan Kou, N. N. Gerasimchuk, and O. A. Gerasimchuk. "Syntheses, crystal structures and coordination compounds of some 2-hetarylcyanoximes." Inorganica chimica acta 284, no. 1 (1999): 85-98.
Inorganica Chimica Acta