Formation of a mixed valence copper(II)–copper(I) coordination polymer {[Cu(1,2-pn)₂(μ₃-I)Cu₂(μ₂-I)₃(CH₃CN)]⋅CH₃CN}_n: in situ reduction of copper(II) at ambient condition

Abstract

A mixed valence copper(II)–copper(I) coordination polymer has been synthesized starting from a copper(II) salt at ambient condition and characterized by IR and Raman spectra and single crystal X-ray diffraction. The structure of the complex consists of a 1-D infinite chain with repeating unit [Cu(1,2-pn)₂(μ₃-I)Cu₂(μ₂-I)₃(CH₃CN)] and a free CH₃CN, where 1,2-pn = 1,2-diamino-1-propene. The complex shows a very short copper(I)–copper(I) distance (2.412 Å).

Keywords:

• Copper(II)
• Copper(I)
• μ₃-I
• Crystal structure
• Coordination polymer

Funding

This work is supported by CSIR, India [Sanction number 01(2730)/13/EMR-II dated 18.04.2013]. S. J. would like to thank CSIR, Government of India for providing fellowship [Sanction No. 09/096(0659)/2010-EMR-I dated 18.1.11]. Crystallographic data were collected at the DST-FIST, India-funded Single Crystal Diffractometer Facility at the Department of Chemistry, Jadavpur University.