Squarato-metal(II) complexes: Part 5. Polynuclear copper(II) complexes bridged by squarate and croconate dianions

被引：15
作者：
Louka, Febee R. [2 ]
Stewart, Alivia D. [2 ]
Regel, Eric [2 ]
Mautner, Franz A. [1 ]
Demeshko, Serhiy [3 ]
Meyer, Franc [3 ]
Massoud, Salah S. [2 ]
机构：
[1] Graz Univ Technol, Inst Phys & Theoret Chem, A-8010 Graz, Austria
[2] Univ Louisiana Lafayette, Dept Chem, Lafayette, LA 70504 USA
[3] Univ Gottingen, Inst Anorgan Chem, D-37077 Gottingen, Germany
来源：
INORGANIC CHEMISTRY COMMUNICATIONS | 2012年 / 22卷
关键词：
Copper; Polynuclear complexes; Bridged squarate; Bridged croconate; Crystal structure; Magnetic properties; CRYSTAL-STRUCTURES; MAGNETIC-PROPERTIES; COORDINATION POLYMERS; MIXED-LIGAND; NICKEL(II); NI; CO; MANGANESE(II); DIHYDRATE; IRON(II);
D O I：
10.1016/j.inoche.2012.04.038
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Two polynuclear Cu(II) complexes namely 1-D polymeric {[Cu(DPA)(mu 1,2-C4O4)(H2O)]center dot 2H(2)O}(n) (1) and the tetranuclear {[Cu-2(DPA)(2)(mu-1,1,2,3-C5O5)(H2O)](ClO4)(2)center dot H2O}(2) (2) where DPA=bis(2-pyridylmethyl) amine, C4O42- = squarate dianion, and C5O52- = croconate dianion were synthesized and structurally characterized by X-ray crystallography. The C4O42- and C5O52- dianions are bridging the Cu2+ centers via a mu-1,2-bis(monodentate) and mu-1,2,3-bis(bidentate)-mu-1-(monodentate) bonding modes in complexes 1 and 2, respectively. A new coordination bonding mode is reported for the bridged croconate in the later complex. Hydrogen bonds stabilize the supramolecular 2D and 3D systems in the complexes. Magnetic susceptibility measurements for the 1D-polymeric complex 1 reveal insignificant coupling between the Cu(II) ions, whereas the tetranuclear croconato complex 2 exhibits moderate antiferromagnetic coupling between the central Cu(II) ions (J = -9.4 cm(-1)) and weak antiferromagnetic coupling between the terminal Cu(II) ions (J= -5.1 cm(-1)). (C) 2012 Elsevier B.V. All rights reserved.
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页码：60 / 64
页数：5
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