The isomerization of triplet and singlet HC drop GeF to C=Ge(H)(F) and to (
H)(F)C=Ge have been studied by various computational methods. Our theoretic
al investigations suggest that electronegative halogen groups can considera
bly stabilize a carbon-germanium triple bond. In particular, triplet HC dro
p GeF. rather than singlet HC=GeF, is predicted to be a promising candidate
for isolation as a long-lived molecule. (C) 2001 Elsevier Science B.V. All
rights reserved.