Coordination complexes of group (IV) halides. Preparation and infrared spectra of the complexes of group (IV) halides with α-cyanoacetamide as ligand

Abstract

Coordination complexes between α-cyanoacetamide as ligand and the group (IV) halides as Lewis acids have been prepared. In all these compounds the ligand has been found to be a bidentate, coordinating to two different metal atoms. The infrared results indicate coordination through the nitrogen of the cyano group and one of the donor atoms of the amide group, probably nitrogen. Some physical properties of the complexes strongly suggest that they are coordination polymers.

Etard reactions. I. Nature of complexes and their reactions with some oxygen and nitrogen donor molecules

“…This confirms the coordination of the nitrile molecule through nitrogen (12). The far infrared spectrum of this substance shows a single, sharp, mediumintensity band at 340 cm-' which may be ascribed to a Cr-Cl stretching mode.…”

Complexes of Group IV halides with mercuric thiocyanate and mercuric cyanide as ligands

“…In the case of Hg(CN), the i.r. spectrum values reported previously (6,21,22), and corre-that both the v(C-N) and v(C-S) stretching spond to the value for which the central metal frequencies increase on coordination of the atom exhibits a coordination number six (23).…”

Molecular Force Field of 4-Cyanopyridine and its Application to 4-Cyanopyridine Metal Complexes

“…The refined set of force constants are shown in Figure 3. is observed in the cyano stretching frequency of the I R spectra of the metal-nitrile complexes [19,22]. O n the other hand, a decrease in cyano-stretching frequency is interpered to result in form the involvement of the cyano-group through its triple band or A electrons [23,26].…”