A tetrazol-5-yl analogue of glycine, 5-ammoniomethyl-1H-tetrazolide, and its copper(II) complex

Abstract

A nonclassical tetrazole isostere of glycine, viz. zwitterionic 5-ammoniomethyl-1H-tetrazolide, C(2)H(5)N(5), (I), crystallizes in the chiral P3(1) space group, similar to gamma-glycine. The crystal packing of (I) is determined by a set of classical hydrogen bonds, forming a three-dimensional network that is practically the same as that in gamma-glycine. The Cu(II) complex of (I), poly[[bis(mu(2)-5-aminomethyl-1H-tetrazolido-kappa(3)N(1),N(5):N(4))copper(II)] dihydrate], {[Cu(C(2)H(4)N(5))(2)].2H(2)O}(n), (II), is a layered coordination polymer formed as a result of tetrazole ring bridges. The Cu(II) cations lie on inversion centres, are surrounded by four anions and adopt elongated octahedral coordination. Water molecules are located in the interlayer space and connect the layers into a three-dimensional network via a system of hydrogen bonds.

2-tert-Butyl-5-(2-pyridyl)-2H-tetrazole as a chelating ligand in the direct synthesis of novel Cu(ii) and heterobimetallic Cu(ii)/Mn(ii) complexes

“…A series of novel 5-R-tetrazolato-bridged Zn(II), Cu(II) and the first Cu(II)/Zn(II) heterobimetallic complexes, as well as complexes of Co(II) and Cu(II) based on 1-substituted tetrazoles, have been isolated and structurally characterized. [34][35][36][37] Considering this approach in combination with our earlier synthetic and structural investigations of metal complexes with 5-substituted tetrazoles 34,35,[38][39][40] and their N-derivatives, 36,37,[41][42][43] we were interested to clear up the behavior of potentially chelating 2-tert-butyl-5-(2-pyridyl)-2H-tetrazole (L) in oxidative dissolution of copper powder in homometalic systems Cu 0 -L-NH 4 X-DMSO (X = Cl, SCN, ClO 4 ) and heterobimetallic ones Cu 0 -Mn(OAc) 2 -L-NH 4 OAc-Solv (Solv = DMSO or DMF), where ammonium salts were used as both protonand anion-donating agents. Herein, we report a facile route for the synthesis of L, its molecular and crystal structure, and present the crystal structures, spectroscopic, thermal and magnetic properties of new homometallic complexes [CuL 2 Cl 2…”