Spectroscopic Studies of Mixed Amine Carbonyl Complexes of d6 Structure. I. Visible and Ultraviolet Absorption Spectra of Diamine-tetracarbonyl Complexes of Chromium(0), Molybdenum(0) and Tungsten(0)
1968; Oxford University Press; Volume: 41; Issue: 2 Linguagem: Inglês
10.1246/bcsj.41.359
ISSN1348-0634
AutoresHide Saito, Junnosuke Fujita, Kazuo Saito,
Tópico(s)Adsorption, diffusion, and thermodynamic properties of materials
ResumoAbstract Chromium(0), molybdenum(0) and tungsten(0) complexes of [M·(CO)4AA]0 type (AA=ethylenediamine (en), l-propylenediamine (l-pn), trimethylenediamine (tn), bipyridyl (bp), and phenanthroline (phen); l-pn and tn derivatives are new compounds) have been synthesized and their absorption spectra, rotatory dispersion (RD) and circular dichroism (CD) measured in methanol at room temperature. The nature of the absorption bands has been discussed by comparing them with one another and with those of hexacarbonyl- and piperidinepentacarbonyl complexes of these elements. The peaks in the region 23000 to 25000 cm−1 seem to be due to spinallowed d–d transition. The bands at 30000 to 33000 cm−1 appears to correspond to the metal to carbonyl charge transfer band of hexacarbonyls at ca. 36000 cm−1. Besides them, complexes of aromatic amines (bp and phen) show broad and strong bands at 21000 to 22000 cm−1 which seem to owe to metal to amine charge transfer.
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