M-NO2 frequencies

[Alan.Shusterman-: at :-directory.reed.edu (Alan Shusterman)]

 I'm trying to distinguish a Co-NO2 complex from a Co-O-NO complex using mid-IR.
 The complexes are low-spin, closed-shell, and I'm wondering what theoretical
 model might give reasonable predictions for the ligand's vibrational
 frequencies.
 
 Any experience with this problem or pointers to published articles would be
 appreciated. Thanks,
 
 -Alan
 
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 Alan Shusterman
 Department of Chemistry
 Reed College
 3203 S.E. Woodstock Blvd.
 Portland, OR 97202
 503-517-7699