TY - JOUR
T1 - Polymethylene spacer regulated structural divergence in cadmium complexes
T2 - Unusual trigonal prismatic and severely distorted octahedral coordination
AU - Banerjee, Suparna
AU - Ghosh, Ashutosh
AU - Wu, Biao
AU - Lassahn, Paul Gerhard
AU - Janiak, Christoph
PY - 2005/3/31
Y1 - 2005/3/31
N2 - Chelation of the tetradentate pyridyl di-Schiff-base ligands, N,N′-bis-(1-pyridin-2-yl-ethylidene)-propane-1,3-diamine (L1) or N,N′-bis-(1-pyridin-2-yl-ethylidene)-ethane-1,2-diamine (L2) to a cadmium(II) centre reveals interesting structural deviations from regular octahedral geometry in the resulting hexacoordinated complexes [Cd(L 1)(NCS)2] (1) and [Cd(L2)(NCS)2] (2), respectively. The two tetradentate ligands L1 and L2 differ only in the polymethylene chain - (CH2)3 and (CH2)2, respectively, which connects the two halves of the symmetric ligands. Complex 1 assumes a trigonal prismatic (TP) geometry. The structure of 2 reveals a severely distorted octahedral geometry. The structural differences between [Cd(L1)(NCS)2] (1) and [Cd(L 2)(NCS)2] (2) can be traced to the length of the polymethylene spacers and the formation of a six- versus a five-membered metal-chelate ring together with the pyramidal Cd(L1) and planar Cd(L2) arrangement.
AB - Chelation of the tetradentate pyridyl di-Schiff-base ligands, N,N′-bis-(1-pyridin-2-yl-ethylidene)-propane-1,3-diamine (L1) or N,N′-bis-(1-pyridin-2-yl-ethylidene)-ethane-1,2-diamine (L2) to a cadmium(II) centre reveals interesting structural deviations from regular octahedral geometry in the resulting hexacoordinated complexes [Cd(L 1)(NCS)2] (1) and [Cd(L2)(NCS)2] (2), respectively. The two tetradentate ligands L1 and L2 differ only in the polymethylene chain - (CH2)3 and (CH2)2, respectively, which connects the two halves of the symmetric ligands. Complex 1 assumes a trigonal prismatic (TP) geometry. The structure of 2 reveals a severely distorted octahedral geometry. The structural differences between [Cd(L1)(NCS)2] (1) and [Cd(L 2)(NCS)2] (2) can be traced to the length of the polymethylene spacers and the formation of a six- versus a five-membered metal-chelate ring together with the pyramidal Cd(L1) and planar Cd(L2) arrangement.
KW - Cadmium complexes
KW - Chelate effect
KW - Di-Schiff-bases
KW - Distortion
KW - Trigonal prism
UR - https://www.scopus.com/pages/publications/15544363611
U2 - 10.1016/j.poly.2005.01.005
DO - 10.1016/j.poly.2005.01.005
M3 - Article
AN - SCOPUS:15544363611
SN - 0277-5387
VL - 24
SP - 593
EP - 599
JO - Polyhedron
JF - Polyhedron
IS - 5
ER -