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Electronic Spectroscopy and Ligand Field Analysis of trans-[CrX<sub>2</sub>([15]aneN<sub>4</sub>)]<sup>+</sup>(X
Electronic Spectroscopy and Ligand Field Analysis of trans-[CrX2([15]aneN4)]+(X
Journal of the Korean Chemical Society. 2003. Apr, 47(2): 109-114
  • Published : April 20, 2003
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Choi, Jong-Ha
Oh, In-Gyung
Lee, Sang Hak
Park, Yu Chul

Abstract
The electronic absorption spectra of trans-$[CrX_2([15]aneN_4)]ClO_4\;([15]aneN_4$=1,4,8,12-tetraazacyclopentadecane; X=F, Cl) complexes have been interpreted using the ligand field theory. An AOMX program is used to optimize the differences between the calculated and the observed positions for the spin-allowed transition bands. The crystal field theory(CFT) parameter is directly related to the angular overlap model(AOM), normalized spherical harmonic hamiltonians(NSH), and semiempirical parameters. The various ligand field parameters are discussed in terms of their chemical significances. According to the ligand field analysis, we can confirm that the fluoride ligand is a very strong ${\sigma}-$ and ${\pi}-$donor while the chloride has weak ${\sigma}-$ and ${\pi}-$donor properties toward chromium(III) ion.
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