Self-assembled macrocyclic molecular squares of Ni(II) derived from carbohydrazones and thiocarbohydrazones: Structural and magnetic studies

被引：37

作者：

Manoj, E.

Kurup, M. R. Prathapachandra ^{[1
]}

Fun, H.-K.

Punnoose, Alex

机构：

[1] Cochin Univ Sci & Technol, Dept Appl Chem, Cochin 682022, Kerala, India

[2] Univ Sains Malaysia, Sch Phys, Xray Crystallograph Unit, George Town 11800, Malaysia

[3] Boise State Univ, Dept Phys, Boise, ID 83725 USA

来源：

POLYHEDRON | 2007年 / 26卷 / 15期

关键词：

self-assembly; carbohydrazone; thiocarbohydrazone; Nickel(II) complex; molecular square; MALDI; magnetism;

D O I：

10.1016/j.poly.2007.05.048

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Four novel molecular square grids were achieved by self-assembly using the flexible ligands bis(di-2-pyridyl ketone) thiocarbohydrazone (H2L1), bis(quinoline-2-carbaldehyde) thiocarbohydrazone (H2L2), bis(di-2-pyridyl ketone) carbohydrazone (H2L3) and bis(2-benzoylpyridine) carbohydrazone (H2L4). Three complexes were given a general formula of [Ni(HL)](4)[PF6](4)center dot nH(2)O and one [Ni-2(HL2)L-2](2)(PF6)(2)center dot 7H(2)O. The MALDI-MS spectra reveal the formation of tetranuclear molecular squares. The square grid of the Ni(II) centers in all the complexes were organized by deprotonated ligands. The complex [Ni(HL1)(4)[PF6](4)center dot 11H(2)O crystallized as [Ni(HL1)](4)(PF6)(4)center dot 0.5CH(3)CH(2)OH center dot 2.8H(2)O and X-ray study revealed octahedral geometries around the Ni(II) centers. Variable temperature magnetic studies suggest intramolecular antiferromagnetic coupling between the Ni(II) electrons by a super exchange mechanism through intervening sulfur/oxygen atoms. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：4451 / 4462

页数：12

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