Microwave measurements of manganese quadrupole coupling in cyclopentadienyl manganese tricarbonyl

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Abstract
Microwave measurements of rotational transitions in cyclopentadienyl manganese tricarbonyl were made using a Flygare–Balle type pulsed beam Fourier transform microwave spectrometer operating in the 4–14 GHz range. Ninety-six hyperfine transitions were assigned for this prolate symmetric top for the rotational transitions J=2→3, 3→4, 4→5, 5→6, and 6→7. Molecular constants obtained from the analysis of the spectrum are B=828.0333(6) MHz, DJ=0.088(9) kHz, DJK=−0.04(3) kHz, eQqaa(Mn)=68.00(4) MHz, Cbb(Mn)=−5.5(8) kHz. The distortion parameter DJ for CpMn(CO)3 is compared to other DJ values for similar type transition metal complexes.