Carbon-13 and nitrogen-15 nuclear magnetic resonance spectroscopy of some (.eta.5-cyclopentadienyl)nitrosyl complexes of the Group 6B elements

Abstract

During the past few years there have been considerable advances in the detection of nitrogen-15 NMR signals at the natural-abundance level. Consequently, it is reasonable to expect that ^(15)N NMR spectra can be obtained for transition-metal nitrosyl complexes. Furthermore, these spectra should provide detailed structural and electronic information about the nitrosyl species in much the same way that ^(13)C NMR spectra elucidate the properties of transition-metal carbonyl compound. We now report the results of the first ^(15)N NMR study of some organometallic nitrosyl complexes, namely, η^5-cyclopentadienyl)nitrosyl derivatives of chromium, molybdenum, and tungsten, and we also compare the ^(15)N and ^(13)C chemical shifts exhibited by these compounds.