Infrared spectroscopic study of copper(II) complexes with N-substituted tetrazoles

Direct Synthesis and Characterization of New Copper(II) and Zinc(II) 5‐R‐Tetrazolato Complexes [R = Me, Ph, 4‐Py] with Ethylenediamine and DMSO as Coligands

“…Vibrational bands of complexes 1 – 3 were characterized in accordance with literature data on IR spectroscopy of corresponding ligands26,27 and related compounds, in particular metal 5‐ R ‐tetrazolates 3e,4a,28. The complexation was found to result in significant changes in absorption bands of endocyclic bonds of tetrazoles 29. In particular, ν (C=N) and ν (N=N) bands of 5‐methyltetrazole at 1580 cm –1 and 1440 cm –1 are found at higher wave numbers, 1607 cm –1 and 1465 cm –1 , respectively, in the spectrum of 1 .…”

“…Moreover, significant changes are obvious in the region of stretching and stretching‐deformation vibrations of the tetrazole ring (1100–900 cm –1 ). The observed changes in absorption bands of endocyclic bonds of tetrazoles under the complexation could be explained by the electron density transfer from the tetrazole ring antibinding orbital to metal ion to form the bonds metal–N tetrazolate , leading to a disruption of the aromaticity of the heterocycle as a whole 29…”

Temperature Inhomogeneity during Multibubble Sonoluminescence

“…Tetrazoles are popular ligands in coordination chemistry. The interest ranges from IR spectroscopic measurements 1, ferromagnetic properties 2 to coordination frameworks 3. Especially compounds bearing more than one tetrazole moiety are used as chelating or bridging ligand.…”

Advances in synthesis of tetrazoles coordinated to metal ions

“…Therefore the N 1 -and N 2 -substituted tetrazoles are involved into the formation of metal derivatives exclusively in the neutral form. [34][35][36][37][38][39][40] The metal ions can bind to the nitrogen atoms of the tetrazole ring by the coordination or the covalent type. It should be noted that in the N 1 -substituted tetrazoles the highest basicity is at the N4 atom; therefore, just this atom of the tetrazole ring in most cases takes part in the formation of the coordination bond.…”