The 14N and 15N derivatives of TpOs(NS)Cl2 [Tp = hydrotris(1-pyrazolyl)borate, a tridentate ligand] have been prepared. The 14N derivative has a nitrogen–sulfur stretch at 1284 cm-1. Predict the N—S stretch for the 15N derivative. (See T. J. Crevier, S. Lovell, J. M. Mayer, A. L. Rheingold, I. A. Guzei, J. Am. Chem. Soc. , 1998 , 120 , 6607.)
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