Three new pseudohalide bridged dinuclear Zn(II), Cd(II) complexes of pyrimidine derived Schiff base ligands: Synthesis, crystal structures and fluorescence studies

Sangita Ray; Saugata Konar; Atanu Jana; Sankar Jana; Amarendra Patra; Sudipta Chatterjee; James A. Golen; Arnold L. Rheingold; Sudhanshu Sekhar Mandal; Susanta Kumar Kar

doi:10.1016/j.poly.2011.11.031

Three new pseudohalide bridged dinuclear Zn(II), Cd(II) complexes of pyrimidine derived Schiff base ligands: Synthesis, crystal structures and fluorescence studies

Sangita Ray
, Saugata Konar
, Atanu Jana
, Sankar Jana
, Amarendra Patra
, Sudipta Chatterjee
, James A. Golen
, Arnold L. Rheingold
, Sudhanshu Sekhar Mandal
, Susanta Kumar Kar

Division of System Semiconductor

University of Calcutta
Serampore College
University of California at San Diego

Research output: Contribution to journal › Article › peer-review

69 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	82-89
Number of pages	8
Journal	Polyhedron
Volume	33
Issue number	1
DOIs	https://doi.org/10.1016/j.poly.2011.11.031
State	Published - 9 Feb 2012

Keywords

H NMR
Emission properties
Pyrimidine derived ligands
X-ray crystal structures
Zinc(II) and cadmium(II) complexes

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10.1016/j.poly.2011.11.031

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title = "Three new pseudohalide bridged dinuclear Zn(II), Cd(II) complexes of pyrimidine derived Schiff base ligands: Synthesis, crystal structures and fluorescence studies",

abstract = "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.",

keywords = "H NMR, Emission properties, Pyrimidine derived ligands, X-ray crystal structures, Zinc(II) and cadmium(II) complexes",

author = "Sangita Ray and Saugata Konar and Atanu Jana and Sankar Jana and Amarendra Patra and Sudipta Chatterjee and Golen, \{James A.\} and Rheingold, \{Arnold L.\} and Mandal, \{Sudhanshu Sekhar\} and Kar, \{Susanta Kumar\}",

year = "2012",

month = feb,

day = "9",

doi = "10.1016/j.poly.2011.11.031",

language = "English",

volume = "33",

pages = "82--89",

journal = "Polyhedron",

issn = "0277-5387",

publisher = "Elsevier Ltd",

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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 -

Three new pseudohalide bridged dinuclear Zn(II), Cd(II) complexes of pyrimidine derived Schiff base ligands: Synthesis, crystal structures and fluorescence studies

Abstract

Keywords

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