Articles you may be interested inThe effect of hydrogen bonding on torsional dynamics: A combined far-infrared jet and matrix isolation study of methanol dimer Considerable discrepancies are frequently observed between the values of torsional barriers detennined by microwave splitting and those obtained from far-infrared transitions, if the usual rigid-top--rigid-frame model is employed. If a nonrigid model which includes first-order coupling with the internal vibrations is used, the requirement of consistency between the microwave and infrared data permits barrier Fourier coefficients Va and V6 to be evaluated without any prior choice of a value of Ired, the reduced moment of the top. This has hitherto been the principal source of uncertainty in the determination of barrier parameters. The torsional parameters F, I red, S, Cl, and f3 are also independently evaluated; from these I a is detennined. Comparison of the "self-consistent" and "a priori" values of parameters such as Ia indicates the extent of interaction with other normal vibrations. The limitation of the treatment involved by the neglect of secondorder vibrational interaction terms, such as centrifugal distortion, can be assessed in cases where microwave data from torsionally excited states is available. The method is applied to CHaCHO, CDaCHO, and CHaCH= CH2, for which accurate far-infrared spectra have been newly determined.

The preparations, i.r. and electronic spectra, and magnetic moments of a range of cobalt( 11) nitrite-complexes with amine ligands are reported, In all cases the nitrite-groups co-ordinate through oxygen, as unidentate nitritegroups in [Co(pyridine),(ONO),],Z(pyridine).CoL,(ONO), where L = isoquinoline or 4-methylpyridine, and Co(diamine),(ONO), where diamine = NN-dimethyl-or NN'-diethyl-ethylenediamine, but as chelating nitrite groups in Co(NNN'N'-tetramethylethylenediamine)(NO,), and in various 3 : 1 and 2 : 1 complexes with heterocyclic amines. Distorted seven co-ordination where L = pyridine or 3-methylpyridine.is suggested for the metal ion in the compounds CoL,(NO,),

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Kobalt(II)‐nitrit‐Komplexe (I‐III) werden durch Erhitzen von Co(II)‐nitrit mit Aminen dargestellt und ihre IR‐ und Elektronenspektren sowie ihre magnetischen Momente untersucht.