Conformational flexibility of 2,6-bis(pyrazol-1-ylmethyl)pyridine (L5) in [(L5)CoII(H2O)3]Cl2 and [(L5)NiII(H2O)2Cl]Cl·H2O. Molecular structures and non-covalent interactions
摘要:
Using a non-planar tridentate ligand 2,6-bis(pyrazol-1-ylmethyl) pyridine (L-5) two new coordination complexes [(L-5)Co-II(H2O)(3)]Cl-2 (1) and [(L-5)Ni-II(H2O)(2)Cl]Cl center dot H2O (2) have been synthesized and structurally characterized. Complex 1 has N3O3 distorted octahedral environment around Co-II with coordination by L-5 (two pyrazole and a pyridine nitrogen in a facial mode) and three water molecules. Complex 2 has N3O2Cl distorted octahedral geometry around Ni-II with meridional L-5 coordination, two water molecules, and a Cl ion. Analysis of the crystal packing diagram reveals the involvement of solvent (water as metal-coordinated and as solvent of crystallization) and counteranion (Cl ) to play significant roles in generating 1D chains, involving O-H center dot center dot center dot Cl, and O-H center dot center dot center dot O interactions. (C) 2011 Elsevier B.V. All rights reserved.