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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 4
BKCSDE 26(4)
April 20, 2005 

Cr(III)-Tetraaza Macrocyclic Complexes Containing Auxiliary Ligands (Part II); Synthesis and Characterization of Cr(III)-Citrato Macrocyclic Complex
Jong Chul Byun*, Yu Chul Park, Jeung Su Youn, Chung Hun Han, Nam Ho Lee
Macrocyclic Cr(III) complex, Bridging citrate ligand, Cr(III) dinuclear complex, Supramolecular species
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 = citrate(cit)} leads to a new dimeric complex cis-[{Cr([14]- decane)( μ-cit)}2](ClO4)2. This binuclear complex has been structurally characterized by a combination of elemental analysis, conductivity, IR and Vis spectroscopy, mass spectrometry, and X-ray crystallography. Analysis of the crystal structure of cis-[{Cr([14]-decane)( μ-cit)}2]+ reveals that each chromium has a distorted octahedral coordination environment and citrato ligands are monodentate to the two chromium atoms via the carboxyl groups. For dimeric complex the bridging geometry is as follows: Cr…Cr = 7.361 A; Cr-O(average) = 1.958 (8) A; Cr-N range = 2.108 (9)-2.147(9) A; N(1)-Cr-N(3) (equatorial position) = 98.0(4)o; N(2)-Cr-N(4) (axial position) = 166.4(4)o; O(1)-Cr-N(2) = 98.1(4)o; O(3)-Cr-N(4) = 96.6(3)o; O(1)-Cr-O(3) = 90.4o. The FAB mass spectrum of the dimeric complex displays peak due to the molecular ions cis-[{Cr([14]-decane) ( μ-cit)}2]+ at m/z 1053.
634 - 640
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