Tetrakis(trimethylstannyl)germanium, the first observation of indirect nuclear Sn-119-Ge-73 spin-spin coupling

Tetrakis(trimethylstannyl)germanium was prepared and studied by H-1, C-13, Ge-73 and Sn-119 NMR spectroscopy. Quadrupolar relaxation of the Ge-73 nucl eus is slow, which allows one to measure (1)J(Sn-117/119, Ge-73) = 37 Hz an d to determine its positive sign by a 2D heteronuclear Ge-73-H-1 shift corr elation, The absolute signs of other coupling constants involving the nucle i H-1, C-13 and Sn-117/119 were also determined either by appropriate 2D sh ift correlations or selective Sn-119{H-1, C-13} double resonance experiment s. Copyright (C) 1999 John Wiley & Sons, Ltd.