The rotational spectrum and theoretical study of a dinuclear complex, MnRe(CO)10

Chakree Tanjaroon, Kristen S. Keck, Stephen G. Kukolich, Michael H. Palmer, Martyn F. Guest

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The first rotational spectrum of a dinuclear complex, MnRe(CO)10, has been obtained using a high-resolution pulsed beam microwave spectrometer. Sixty-four hyperfine components of the J=11→J′=12 and J=12→J′=13 rotational transitions were measured for two rhenium isotopomers. The B values obtained from the experiment are B=200.36871(18) MHz for the 187Re isotopomer and B=200.5561(10) MHz for the 185Re isotopomer. The measuredrotational constants are in reasonably good agreement with the B values calculated from the x-ray diffraction structural data, and from theoretical calculations. The gas-phase Mn–Re bond distance is approximately 2.99 Å, and the calculated value is only slightly longer. The experimental quadrupole coupling constant for the manganese atom is eQqaa (55Mn)=−16.52(5) MHz, and the corresponding quadrupole coupling constants for the two rhenium isotopomers are eQqaa (187Re)=370.4(4) MHz and eQqaa (185Re)=390.9(6) MHz. The quadrupole coupling constants were also determined from a variety of theoretical calculations, with very large Gaussian orbital bases. The best estimates, at a nonrelativistic level, are eQqaa (55Mn)=0.68 MHz and eQqaa (187Re)=327.6 MHz with a 874 GTO basis set, but the results are very basis set dependent, especially the sign of the Mn quadrupole coupling. Very slight bending of angles MnCeqOeq and ReCeqOeq angles is found in the calculations.

Original languageEnglish
Article number4715
JournalThe Journal of Chemical Physics
Issue number10
Publication statusPublished - 8 Mar 2004


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