Supramolecular interactions in [(2,2′‐bipy)M(SeC{O}Ph)₂], (M=Zn or Cd)

Synthesis and crystal structure packing of [(2,2′‐bipy)M(SeC{O}Ph)₂], where M=Zn, (1) or Cd, (2), are described. In 1, the pyridyl groups in 2,2′‐bipy rings are engaged in π ··· π interactions with the neighboring pyridyl rings to form 1D polymer along c‐axis. The neighboring phenyl rings also have close π ··· π contacts generating 2D supramolecular sheets in ac‐planes. On the other hand, two [(2,2′‐bipy)Cd(SeC{O}Ph)₂] molecules form a dimer at the crystallographic inversion center through Se ··· Se interactions. A pair of 2,2′‐bipy rings from neighboring dimers interact through π ··· π contacts and hence propagating this as a 1D supramolecular chain. The difference in the packing has been attributed difference in conformation of monomers due to coordination number and geometry.

Keywords:

• selenobenzoate ligand
• pi ··· pi stacking
• crystal packing
• 2,2′‐bipyridine
• supramolecular interactions

Support from the National University of Singapore (Grant No. R‐143‐000‐252‐112) to J. J. Vittal is gratefully acknowledged.

Crystallographic data for 1 and 2 have been deposited at the Cambridge crystallographic Data Centre with CCDC numbers 649709 and 649710 respectively. Copies of the information can be obtained free of charge from The Director, CCDC, 12 Union Road, Cambridge CB2 1EZ, UK (Fax: [phone]; E-mail: [email protected] or http://www.ccdc.cam.ac.uk).This paper is dedicated to Prof. Roesky.