TY - JOUR
T1 - Syntheses, X-ray crystal structures and spectroscopic characterization of rare μ-di-σ pyrazole based bridging keto carbonyl complexes derived from Cd(II) salts
AU - Das, Kinsuk
AU - Konar, Saugata
AU - Pal, Pampi
AU - Jana, Atanu
AU - Chatterjee, Sudipta
AU - Mukhopadhyay, Subrata
N1 - Publisher Copyright:
© 2014 Elsevier Ltd. All rights reserved.
PY - 2015/1/8
Y1 - 2015/1/8
N2 - The pyrazole based ligands (E)-2-(3,5-dimethyl-1H-pyrazol-1-yl)-N′-(pyridin-2-ylmethylene acetohydrazide (N-PzOPyH) and (E)-5-methyl-N′-(pyridin-2-ylmethylene)-1H-pyrazole-3-carbo hydrazide (PzOPyH), a 1:1 condensation product of 2-(3,5-dimethyl-1H-pyrazol-1-yl)aceto hydrazide and 5-methylpyrazole-3-carbohydrazide with pyridine-2-carbaldehyde respectively, and their keto oxygen bridged Cd(II) complexes [Cd2(N-PzOPy)2(H2O)4](ClO4)4(1), [Cd2(PzOPy)2(H2O)4](ClO4)4(2) and [Cd2(PzOPy)2(NO3)4] (3)] are reported. They have been characterized structurally and spectroscopically. The potential tetradentate NONN-donor ligands N-PzOPyH and PzOPyH are engaged in the coordination around the cadmium(II) center through the nitrogen atoms of pyrazole, azomethine and pyridine and the ketonic oxygen atom of the carbohydrazide group to form complexes 1, 2 and 3, respectively. These ligands span themselves in the equatorial plane and the pentagonal bipyramidal geometry is completed around the metal centres (with an N3O4chromophore) with two apical water molecules (for 1 and 2) and with two nitrate ions (for 3). These keto bridged Cd(II) complexes are further stabilised by supramolecular interactions, like π« π, C-H» π and H-bonding interactions.
AB - The pyrazole based ligands (E)-2-(3,5-dimethyl-1H-pyrazol-1-yl)-N′-(pyridin-2-ylmethylene acetohydrazide (N-PzOPyH) and (E)-5-methyl-N′-(pyridin-2-ylmethylene)-1H-pyrazole-3-carbo hydrazide (PzOPyH), a 1:1 condensation product of 2-(3,5-dimethyl-1H-pyrazol-1-yl)aceto hydrazide and 5-methylpyrazole-3-carbohydrazide with pyridine-2-carbaldehyde respectively, and their keto oxygen bridged Cd(II) complexes [Cd2(N-PzOPy)2(H2O)4](ClO4)4(1), [Cd2(PzOPy)2(H2O)4](ClO4)4(2) and [Cd2(PzOPy)2(NO3)4] (3)] are reported. They have been characterized structurally and spectroscopically. The potential tetradentate NONN-donor ligands N-PzOPyH and PzOPyH are engaged in the coordination around the cadmium(II) center through the nitrogen atoms of pyrazole, azomethine and pyridine and the ketonic oxygen atom of the carbohydrazide group to form complexes 1, 2 and 3, respectively. These ligands span themselves in the equatorial plane and the pentagonal bipyramidal geometry is completed around the metal centres (with an N3O4chromophore) with two apical water molecules (for 1 and 2) and with two nitrate ions (for 3). These keto bridged Cd(II) complexes are further stabilised by supramolecular interactions, like π« π, C-H» π and H-bonding interactions.
KW - Cadmium(II) complexes
KW - Photoluminescence
KW - Pyrazole derived ligands
KW - Supramolecular interactions
KW - X-ray crystal structure
UR - http://www.scopus.com/inward/record.url?scp=84907573406&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2014.08.043
DO - 10.1016/j.poly.2014.08.043
M3 - Article
AN - SCOPUS:84907573406
SN - 0277-5387
VL - 85
SP - 172
EP - 180
JO - Polyhedron
JF - Polyhedron
ER -