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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 5
BKCSDE 27(5)
May 20, 2006 

 
Title
Syntheses and Characterization of Cr(III)-Hydrogensalicylato and -Hydroxonitrophenolato Tetraaza Macrocyclic Complexes
Author
Jong Chul Byun*, Chang Hoon Yoon, Dae Hun Mun, Ki Ju Kim, Yu Chul Park
Keywords
Macrocyclic Cr(III) complex, Crystal structure, Salicylate, Nitrophenolate
Abstract
Chromium(III) complexes, cis-[Cr([14]-decane)(HOC6H4COO)2]ClO4 I and cis-[Cr([14]-decane)(OH) (OC6H4NO2)]ClO4·H2O II ([14]-decane = rac-5,5,7,12,12,14-hexamethyl-1,4,8,11-teraazacyclotetradecane) are synthesized and structurally characterized by a combination of elemental analysis, conductivity, IR and VIS spectroscopy, and X-ray crystallography. The complexes crystallizes in the monoclinic space groups, C21/a in I and P21/n in II. Analysis of the crystal structure of complex I reveals that central chromium(III) ion has a distorted octahedral coordination environment and two hydrogensalicylato ligands are unidentate to the chromium(III) ion via the carboxyl groups in the cis-position. For monomeric complex I the hydrogensalicylato coordination geometry is as follows: Cr-O(average) = 1.984(3) A; Cr-N range = 2.105(3)-2.141(4) A; C(24)- O(4) = 1.286(5) A; N(2)-Cr-N(4) (equatorial position) = 96.97(15)o; N(1)-Cr-N(3) (axial position) = 168.27(15)o; O(1)-Cr-O(4) = 85.70(13)o. The crystal structure of II has indicated that chromium(III) ion is sixcoordinated by four secondary amines of the macrocycle, hydroxide anion and nitrophenolate anion.
Page
687 - 693
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