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

摘要

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 pi center dot center dot center dot pi interactions with the neighboring pyridyl rings to form 11) polymer along c-axis. The neighboring phenyl rings also have close pi center dot center dot center dot pi 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 center dot center dot center dot Se interactions. A pair of 2,2'-bipy rings from neighboring dimers interact through pi center dot center dot center dot pi contacts and hence propagating this as a ID supramolecular chain. The difference in the packing has been attributed difference in conformation of monomers due to coordination number and geometry.