Home
Resources
Publications
Synthesis and Characterization of the Chromium(III) Complexes of Ethylene Cross-Bridged Cyclam and Cyclen Ligands

Synthesis and Characterization of the Chromium(III) Complexes of Ethylene Cross-Bridged Cyclam and Cyclen Ligands

Danny L Maples, Randall D Maples, Wesley A Hoffert, Trenton H Parsell, Alan van Asselt, Jon D Silversides, Stephen J Archibald, Timothy J Hubin

Inorganica Chim Acta. 2009 Apr 20;362(6):2084-2088.

PMID: 20161052

Abstract:

Dichloro(4,10-dimethyl-1,4,7,10-tetraazabicyclo[5.5.2]tetradecane)chromium(III) chloride, Dichloro(4,10-dibenzyl-1,4,7,10-tetraazabicyclo[5.5.2]tetradecane) chromium(III) chloride, and Dichloro(4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2] hexadecane)chromium)(III) chloride have been prepared by the reaction of anhydrous chromium(III) chloride with the appropriate cross-bridged tetraazamacrocycle. Aquation of these complexes proved difficult, but Chlorohydroxo(4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane)chromium)(III) chloride was synthesized directly from chromium(II) chloride complexation followed by exposure or the reaction to air in the presence of water. The four complexes were characterized by X-ray crystal structure determination. All contain the chromium(III) ion in a distorted octahedral geometry and the macrocycle in the cis-V configuration, as dictated by the ethylene cross-bridge. Further characterization of the hydroxo complex reveals a magnetic moment of mu(eff) = 3.95 B.M. and electronic absorbtions in acetonitrile at lambda(max) = 583nm (epsilon = 65.8 L/cm.mol), 431nm (epsilon = 34.8 L/cm.mol) and 369nm (epsilon = 17 L/cm.mol).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP10049055	Chromium(II) chloride		10049-05-5	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: