ISSN:
0009-2940
Keywords:
Ethylcycloarsoxane
;
Copper(I) halide complexes
;
Layered structures
;
Macrocyclic ligands
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
In complexes of ethylcycloarsoxane (C2H3AsO)n, the oligomer size n is influenced by the coordinated metal atom. Cyclic tetramers are observed in the porous sheet structures of ∞2[Cu2Br2{cyclo-(C2H5AsO)4}3] (1) and 2∞ [Cu3I3{cyclo-(C2H5As0)4)2] (2), prepared by the reaction of the appropriate copper(I) halide with (C2H5AsO)n in acetonitrile. Both complexes contain μ1κAs1:2κAs3-coordinated (C2H5AsO)4 ligands as molecular bridging units between individual copper(I) centres leading to large respectively 36- and 40-membered rings. An analogous bridging mode is found in the cyclic oligomers [cyclo-(ReBr(CO)3{μ-[cyclo-(C2H5AsO)}}4](3) formed by reacting {ReBr(CO)5] with (C2H5AsO)n in refluxing toluene. - In contrast both [(NH4){cyclo- (C2H5AsO)5}2][Ag(SCN)]2 (4) and 2∞[(Cs(cyclo-(C2H5-AsO)3]2} Cu2(μ-I)I2] (5) contain pentamers (C2H5AsO)5, which coordinate the NH+4 and Cs+ cations κ5O in a pentagonal antiprismatic fashion. In 5, prepared by self-assembly from CsI, CuI, and (C2H5AsO)n in acetonitrile, [Cs[cyclo-{C2H5AsO}5)2]+ sandwich cations are linked thorough μ-1κAs1:2κAs2-coordinated [Cu2l3]- units into polymeric chains. This coordination pattern reflects the unique ring size adaptability of the ambidentate (C2J5AsO)n ligand.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19971300311
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