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In the title compound, {[Cu(C 5 H 4 N 4 S 4 ) 2 (C 2 H 3 N) 2 ](ClO 4 ) 2 ·C 2 H 3 N}  n  , the Cu II  atom occupies a crystallographic inversion centre and is six-coordinated by six N atoms of four symmetry-related 2,2′-(methyl­enedithio)bis­(1,3,4-thia­diazole) ( L ) ligands and two acetonitrile mol­ecules in a slightly distorted octa­hedral geometry. The ligand  L  adopts an  N : N ′-bidentate bridging mode in a  trans  configuration, bridging the Cu atoms  via  translation symmetry, forming a two-dimensional layer-like structure. The perchlorate ions serve as acceptors for inter­molecular C—H⋯O hydrogen bonds, which link the layers into a three-dimensional network. The ClO 4−  anion is disordered with an occupation ratio of 0.658:0.342.

acta crystallographica. section e

Poly[[bis(acetonitrile-κN)bis[μ2-2,2′-(methylenedithio)bis(1,3,4-thiadiazole)-κ2N4:N4′]copper(II)] bis(perchlorate) acetonitrile solvate]