The geminal P–P coupling constant increases by more than 90 Hz. as the temperature is decreased from 0 to –120° in PF2SPF2; equally large percentage variations in 2JPP have been observed in bis(phosphino)silanes and germanes.
R. A. Newmark, A. D. Norman and R. W. Rudolph, J. Chem. Soc. D, 1969, 893a DOI: 10.1039/C2969000893A
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