The rH nmr spectrum of zr-tropyliumvanadium( I) tricarbonyl (1) at 30' in nonviscous solutions is a broad doublet; in viscous solut ions the spectrum is a relat ively sharp singlet. The temperature dependence of this spectrum in toluene-dr and its viscosity dependence in mixturis of ciclooctane and Nujol establish that the observed spectral l ine shapes in nonviscous media are due to 5rV-rH spi...
