Molecular squares of NiII and CuII: ferromagnetic exchange interaction mediated by syn-anti carboxylate-bridging

被引:45
作者
Arora, Himanshu [1 ]
Lloret, Francesc [2 ]
Mukherjee, Rabindranath [1 ]
机构
[1] Indian Inst Technol, Dept Chem, Kanpur 208016, Uttar Pradesh, India
[2] Univ Valencia, ICMol, Valencia 46980, Spain
关键词
MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; COPPER(II) COMPLEXES; DONOR LIGANDS; MALONIC-ACID; CO-II; TETRANUCLEAR; NETWORKS; CLUSTER;
D O I
10.1039/b905463d
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The synthesis of four discrete tetranuclear complexes {[Ni-II(L-2)][ClO4]}(4)center dot MeCN (1), {[Cu-II(L-1)(O3SCF3)]}(4)center dot H2O (2), {[Cu-II(L-3)(OClO3)]}(4)center dot MeCN (3) and {[Cu-II(L-4)][ClO4]}(4)center dot 3MeCN center dot 4H(2)O (4), supported by a closely similar group of carboxylate-appended (2-pyridyl) alkylamine ligands [L-1(-): 3-[N-methyl-{2-(pyridin-2-yl)ethyl}amino]propionate; L-2(-): 3-[(2-(pyridin-2-yl)ethyl){2-(pyridin-2-yl) methyl}amino]propionate; L-3(-): 3-[N-isopropyl-{2-(pyridin-2-yl)methyl}amino]propionate and L-4(2-): 3-[N-{2-(pyridin-2-yl)methyl}amino]-bis(propionate)] is described. Structural characterization reveals that each Ni-II centre in 1 has square-pyramidal (NiN3O2)-N-II coordination and each Cu-II centre in 2-4 has distorted square-pyramidal (CuN2O3)-N-II coordination, utilizing three N and one carboxylate O in 1 and two N and carboxylate O (one in 2 and 3; two in 4) of the ligand and the fifth/fourth coordination is provided by an oxygen atom belonging to the carboxylate group of an adjacent molecule. A CF3SO3- or a ClO4- ion provides an O coordination in 2 and 3, respectively. Temperature-dependent magnetic studies reveal the existence of ferromagnetic exchange interaction in each case, due to the presence of equatorial-equatorial syn-anti carboxylate bridge between M-II centres.
引用
收藏
页码:9759 / 9769
页数:11
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