Charge-transfer complexes of benzylviologen (1,1′-dibenzyl-4,4′-bipyridinium(2+) cation) with cyanocuprate(I) and the structure of (BzV)3Cu9(CN)15·H2O

Michiko B. Inoue*, Motomichi Inoue, Lorena Machi, Francisco Brown, Quintos Fernando

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Reactions between 1,1′-dibenzyl-4,4′-bipyridinium(2+) (benzylviologen, BzV) chloride and cyanocuprates(I) gave two charge-transfer complexes having different colors: dark brown (BzV)3Cu9(CN)15·H2O and light brown (BzV)Cu(CN)3·2H2O. An X-ray crystal analysis of the former compound showed that nine crystallographically nonequivalent Cu atoms form three kinds of triad Cu(CN)Cu screws, which are linked by CN groups resulting in a unique three-dimensional network structure. Three of the nine Cu atoms have distorted tetrahedral (td) coordination geometries while the others have triangular plane (tp) geometries. Each screw consists of a (-tp-td-tp-)n array. There are three crystallographically nonequivalent viologen molecules. Certain CuCN moieties are located above a viologen ring or by the side of a viologen ring, with close interatomic contacts. These close contacts are characteristic of the charge-transfer complex and are responsible for the deep color of the complex.

Original languageEnglish
Pages (from-to)145-151
Number of pages7
JournalInorganica Chimica Acta
Issue number1-2
StatePublished - 1 Mar 1995

Bibliographical note

Funding Information:
The work at the Universidad de Sonora was supported by the Consejo Nacional de Ciencia y Tecnologfa, Mexico (0202-E9107).


  • Copper complexes
  • Crystal structures
  • Cyanocuprate complexes
  • Viologen complexes


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