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A heterotetranuclear Cu II Pb II  complex containing 2-dimethylaminoethanol has been synthesized, using copper powder and PbBn 2  as starting materials, and characterized by X-ray crystallography. The crystal is composed of centrosymmetric molecules [CuPbBr 2 {(CH 3 ) 2 NCH 2 CH 2 O} 2 dmso] 2 . The central strictly planar fragment is a Pb 2 O 2  parallelogram completed by bridging oxygen atoms of chelating 2-dimethylaminoethoxo groups. The Pb atom forms four quite short bonds with oxygen atoms of the three 2-dimethylaminoethoxo groups and of the dmso molecule and assumes a six-coordinate structure also involving two bromine atoms. The two oxygen and two nitrogen atoms of two 2-dimethylaminoethoxo groups form the copper coordination environment, which possesses a somewhat distorted square planar geometry.

Crystal Structure of the Di-bromo-bis(2-dimethylaminoethanolato)(dimethylsulfoxide)-copper(II)-lead(II) Dimer Obtained by Direct Synthesis