Chemistry

Copper bromide complexes with triethylbenzylammonium (TEBA): the ladder complex (TEBA)2Cu2Br6, the polymorph dimer α-(TEBA)2Cu2Br6, and the monomeric salt (TEBA)2CuBr4

Document Type

Article

Abstract

Two new complexes of copper(II) with bromide ligands and triethylbenzylammonium (TEBA) cations are reported, α-(TEBA)2[Cu2Br6] (1), and (TEBA)2[CuBr4] (2). The syntheses, crystal structures, and magnetic properties are described. 1 crystallizes as bibromide bridged dimers which are linked into square layers via short Br…Br contacts. Variable temperature magnetic susceptibility data indicate ferromagnetic interactions within the dimers (J/kB = 107(4) K) with weak interdimer antiferromagnetic interactions (θ = −3.47(6) K). 2 crystallizes as discrete tetrabromidocuprate anions which are well isolated by the bulk of the TEBA cations. Magnetic susceptibility measurements indicate negligible magnetic interactions in the material. The magnetic properties of the known polymorph (TEBA)2[Cu2Br6] (3) were reexamined in light of the properties of 1 and suggest a significantly stronger interaction within the dimer (J/kB ∼ 110(4) K) than originally proposed. These findings are in agreement considering the nearly identical structures of the Cu2Br62- dimers in 1 and 3.

Publication Title

Journal of Coordination Chemistry

Publication Date

2024

ISSN

0095-8972

DOI

10.1080/00958972.2024.2431843

Keywords

Bromidocuprate, Dimer, agnetic susceptibility, X-ray

Cross Post Location

Physics

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