Synthesis, structure and magnetic properties of a tetranuclear Copper(II) complex on the basis of a 2-substituted glucopyranoside Schiff base ligand

被引:27
作者
Burkhardt, Anja [1 ]
Buchholz, Axel [1 ]
Goerls, Helmar [1 ]
Plass, Winfried [1 ]
机构
[1] Univ Jena, Inst Anorgan & Analyt Chem, D-07745 Jena, Germany
关键词
carbohydrates; Schiff base ligands; copper(II) complexes; magnetic properties;
D O I
10.1002/ejic.200600404
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Condensation of a derivatized 2-aminoglucose fragment with salicylaldehyde affords the new sugar-based Schiff base ligand benzyl 4,6-O-benzylidene-2-deoxy-2-salicylideneamino-alpha-D-glucopyranoside (H2L). The reaction of the dibasic ligand H2L with [Cu(CH3COO)(2)](H2O)-H-. leads to the formation of the tetranuclear copper(II) complex [{Cu(L)}(4)] (3) by a self-assembly process. The X-ray structural analysis of complex 3 which crystallizes together with two molecules of chloroform and one molecule of ethanol in the space group P2(1)2(1)2(1) revealed for all copper atoms a NO3 coordination environment with a square-planar geometry. The tetranuclear molecule 3 consists of four chiral building blocks {Cu(L)} with the rare 2,3-coordination of the trans-configured donor atoms of the sugar backbone. The observed coordination mode of the building blocks exemplifies how chitosan-derived polysaccharide ligands can act as a chiral support for transition-metal complexes. The C-3 alcoholate oxygen atoms of the carbohydrate unit is bridging adjacent {Cu(L)} moieties resulting in an eight-membered Cu4O4 ring with a boat-like conformation. Temperature-dependent magnetic measurements of 3 indicate moderate antiferromagnetic interactions between the four copper(II) ions with a coupling constant of J = -130 cm(-1). ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006).
引用
收藏
页码:3400 / 3406
页数:7
相关论文
共 51 条
[1]  
Burger J, 1995, ANGEW CHEM INT EDIT, V34, P2647
[2]  
BURGER J, 1995, ANGEW CHEM, V107, P2950
[3]   O,N,O′-tridentate ligands derived from carbohydrates in the V(IV)-promoted asymmetric oxidation of thioanisole [J].
Cucciolito, ME ;
Del Litto, R ;
Roviello, G ;
Ruffo, F .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2005, 236 (1-2) :176-181
[4]   CRYSTALLOGRAPHIC STUDIES OF THE MECHANISM OF XYLOSE ISOMERASE [J].
FARBER, GK ;
GLASFELD, A ;
TIRABY, G ;
RINGE, D ;
PETSKO, GA .
BIOCHEMISTRY, 1989, 28 (18) :7289-7297
[5]   Chiral channels in a 3-D network of self-assembled tetranuclear copper(II) aggregates [J].
Fragoso, A ;
Kahn, ML ;
Castiñeiras, A ;
Sutter, JP ;
Olivier, K ;
Cao, R .
CHEMICAL COMMUNICATIONS, 2000, (16) :1547-1548
[6]  
GRACY RW, 1968, J BIOL CHEM, V243, P4109
[7]   OPTICALLY PURE N-SUBSTITUTED DERIVATIVES OF BENZYL 2-AMINO-2-DEOXY-ALPHA- AND -BETA-D-GLUCOPYRANOSIDE [J].
GROSS, PH ;
JEANLOZ, RW .
JOURNAL OF ORGANIC CHEMISTRY, 1967, 32 (09) :2759-&
[8]  
GYORGYDEAK Z, 1991, LIEBIGS ANN CHEM, P1291
[9]   POLYOL METAL-COMPLEXES .2. COPPER(II) COMPLEXES WITH MULTIPLY DEPROTONATED ETHYLENE-GLYCOL, ANHYDRO-ERYTHRITOL, OR METHYL ALPHA-D-MANNOPYRANOSIDE AS LIGANDS [J].
HABERMANN, N ;
JUNG, G ;
KLAASSEN, M ;
KLUFERS, P .
CHEMISCHE BERICHTE-RECUEIL, 1992, 125 (04) :809-814
[10]   MANGANESE AND CALCIUM-BINDING SITES OF CONCANAVALIN-A [J].
HARDMAN, KD ;
AGARWAL, RC ;
FREISER, MJ .
JOURNAL OF MOLECULAR BIOLOGY, 1982, 157 (01) :69-86