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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 7
BKCSDE 25(7)
July 20, 2004 

 
Title
Cr(III)-Tetraaza Macrocyclic Complexes Containing Auxiliary Ligands (Part I); Synthesis and Characterization of Cr(III)-Benzoato and Chlorobenzoato Macrocyclic Complexes
Author
Jong Chul Byun*, Goo Cheul Kim, Chung Hun Han
Keywords
Macrocycle, Cr(III) complexes, Chlorobenzoate ligand, Crystal structure
Abstract
The reaction of cis-[Cr([14]-decane)(OH2)2]+ ([14]-decane = rac-5,5,7,12,12,14-hexamethyl-1,4,8,11-teraazacyclotetradecane) with auxiliary ligands {La = benzoate(bz) or chlorobenzoate(cbz)} leads to a new compound [Cr([14]-decane)(bz)2]ClO4 or [Cr([14]-decane)(cbz)2]ClO4. These complexes have been characterized by a combination of elemental analysis, conductivity, IR and Vis spectroscopy, mass spectrometry, and X-ray crystallography. The crystal structure of [Cr([14]-decane)(cbz)2]+ was determined. The complex shows a distorted octahedral coordination environment with the macrocycle adopting a folded cis-V conformation. The angle Naxial-Cr-Naxial deviates by 14.5o from the ideal value of 180o for a perfect octahedron. The bond angle cis-O-Cr-O between the Cr(III) ion and the two carboxylate oxygen atoms of the monodentate p-chlorobenzoate ligands is close to 90o. The FAB mass spectra of the cis-[Cr([14]-decane)(La)2]ClO4 display peaks due to the molecular ions [Cr([14]-decane)(bz)2-H]+, [Cr([14]-decane)(cbz)2-2H]+ at m/z 578, 646, respectively.
Page
977 - 982
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