Interionic C–H···O hydrogen bond distances have been investigated in organometallic and inorganic salts showing that the average lengths unequivocally follow the order [(M)C–H]+···[O]-<(M)C–H···O (M=first row transition metal) and [(PPh4)C–H]+···[OM]-<[(PPN)C–H]+···[OM]-<[(BPh4)C–H]-···[OM]+, which is the order of decreasing charge assistance to the weak hydrogen bonds.
D. Braga and F. Grepioni, New J. Chem., 1998, 22, 1159 DOI: 10.1039/A806554C
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