TY - JOUR
T1 - Three new pseudohalide bridged dinuclear Zn(II), Cd(II) complexes of pyrimidine derived Schiff base ligands
T2 - Synthesis, crystal structures and fluorescence studies
AU - Ray, Sangita
AU - Konar, Saugata
AU - Jana, Atanu
AU - Jana, Sankar
AU - Patra, Amarendra
AU - Chatterjee, Sudipta
AU - Golen, James A.
AU - Rheingold, Arnold L.
AU - Mandal, Sudhanshu Sekhar
AU - Kar, Susanta Kumar
PY - 2012/2/9
Y1 - 2012/2/9
N2 - One new dinuclear Zn(II) complex, [(N 3)Zn(L 1) (μ 1,1-N 3)] 2 (1), and a dinuclear Cd(II) complex, [(N 3)Cd(L 1)(μ 1,1-N 3)] 2 (2), of the potentially tridentate NNN-donor Schiff base ligand N-(4,6-dimethyl-pyrimidin-2-yl)-N′-(1-pyridin-2-yl-ethylidine) -hydrazine (L 1) and another dinuclear Cd(II) complex [(NCS)Cd(L 2)(μ 1,3-NCS)] 2 (3) of a similar NNN donor Schiff base ligand, N-(4,6-dimethyl-pyrimidin-2-yl)-N′-pyridin-2- ylmethylene-hydrazine (L 2), have been synthesized and characterized by elemental analyses, IR, 1H NMR, fluorescence spectroscopy and single crystal X-ray crystallography. The fluorescence spectral changes observed upon addition of the Zn(II) ion to a mixture of L 1 and azide showed high selectivity towards the Zn(II) ion over other metal ions. The ligands L 1 and L 2 are [1 + 1] condensation products of 2-hydrazino-4,6-dimethyl pyrimidine with 2-acetyl pyridine and pyridine-2-carbaldehyde, respectively. In the complexes 1 and 2 the two Zn(II) and Cd(II) centers are held together by μ 1,1-bridged azide ions, while in 3 the two Cd(II) centers are bridged by μ 1,3-thiocyanate ions. Complex 1 shows high chelation enhanced fluorescence compared to 2 and 3. All the metal centers have a distorted octahedral geometry.
AB - One new dinuclear Zn(II) complex, [(N 3)Zn(L 1) (μ 1,1-N 3)] 2 (1), and a dinuclear Cd(II) complex, [(N 3)Cd(L 1)(μ 1,1-N 3)] 2 (2), of the potentially tridentate NNN-donor Schiff base ligand N-(4,6-dimethyl-pyrimidin-2-yl)-N′-(1-pyridin-2-yl-ethylidine) -hydrazine (L 1) and another dinuclear Cd(II) complex [(NCS)Cd(L 2)(μ 1,3-NCS)] 2 (3) of a similar NNN donor Schiff base ligand, N-(4,6-dimethyl-pyrimidin-2-yl)-N′-pyridin-2- ylmethylene-hydrazine (L 2), have been synthesized and characterized by elemental analyses, IR, 1H NMR, fluorescence spectroscopy and single crystal X-ray crystallography. The fluorescence spectral changes observed upon addition of the Zn(II) ion to a mixture of L 1 and azide showed high selectivity towards the Zn(II) ion over other metal ions. The ligands L 1 and L 2 are [1 + 1] condensation products of 2-hydrazino-4,6-dimethyl pyrimidine with 2-acetyl pyridine and pyridine-2-carbaldehyde, respectively. In the complexes 1 and 2 the two Zn(II) and Cd(II) centers are held together by μ 1,1-bridged azide ions, while in 3 the two Cd(II) centers are bridged by μ 1,3-thiocyanate ions. Complex 1 shows high chelation enhanced fluorescence compared to 2 and 3. All the metal centers have a distorted octahedral geometry.
KW - H NMR
KW - Emission properties
KW - Pyrimidine derived ligands
KW - X-ray crystal structures
KW - Zinc(II) and cadmium(II) complexes
UR - https://www.scopus.com/pages/publications/84855836087
U2 - 10.1016/j.poly.2011.11.031
DO - 10.1016/j.poly.2011.11.031
M3 - Article
AN - SCOPUS:84855836087
SN - 0277-5387
VL - 33
SP - 82
EP - 89
JO - Polyhedron
JF - Polyhedron
IS - 1
ER -