33997-11-4Relevant academic research and scientific papers
Multimethod investigation of fluxional behavior in (pentachlorocyclopentadienyl)mercurials η1-C5Cl5HgR
Wulfsberg, Gary P.,Frye, James S.,Buchanan III,Weiss, Alarich,Jui, Charles Chia-Chung,Davis, Daniel A.,Bass, Kevin,Todd, Roger W.
, p. 2363 - 2370 (2008/10/08)
Possible solid-state fluxional behavior in various (pentachlorocyclopentadienyl)mercurials (η1-C5Cl5HgR) has been investigated by using 13C NMR spectroscopy with cross-polarization and magic-angle spinning and by using 35Cl nuclear quadrupole resonance (NQR) spectroscopy. Unusual mercuration reactions are reported which are convenient synthetic methods for these compounds. Fluxional behavior has been established in the solid state for (η1 = pentachlorocyclopentadienyl)(pentamethylphenyl)mercury (R = C6(CH3)5) from its variable-temperature magic-angle-spinning 13C NMR spectrum. The expected consequences of fluxional behavior also appear in the 13C NMR spectrum of this compound in CD2Cl2 solution and in the 35Cl NQR spectra of this and several other (pentachlorocyclopentadienyl)mercurials. From their NQR fadeout temperatures and NMR spectra the rate of fluxional exchange appears to increase in the order R = C5Cl5 6H5 6(CH3)5. Since their time scales are similar, the two solid-state methods serve as complementary methods for studying fluxional behavior: the NMR method is most easily used to obtain fast-exchange data, while NQR is more easily applied at slow-exchange temperatures.
