Negatively charged hydrogen-bonded chains formed by tetrazole

The complexes formed by tetrazole with MTBD, an N-base of guanidin-like cha racter, were studied by FTIR spectroscopy. In the chloroform solution of 1: 1 ratio, a N- ... H+MTBD asymmetrical complex is formed and no dissociation of this complex is visible. With increasing tetrazole-MTBD ratio, the form ation of chains of tetrazole molecules is observed. In acetonitrile solutio n of tetrazole with MTBD, the amount of protonated and dissociated H+MTBD s pecies increases with increasing concentration of tetrazole. In these mixtu res, negatively charged chains are observed to be formed with tetrazole mol ecules only; however, some amount of free tetrazole molecules is also detec ted in this case. All these chains show large proton polarizability (C) 199 9 Elsevier Science B.V. All rights reserved.