186205-12-9Relevant academic research and scientific papers
Effects of a Nonligating Pendant Hydrogen-Bonding Group in a Metal Complex: Stabilization of an HF Complex
Lee, Dong-Heon,Kwon, Hye J.,Patel, Ben P.,Liable-Sands, Louise M.,Rheingold, Arnold L.,Crabtree, Robert H.
, p. 1615 - 1620 (2008/10/08)
An amino group has been appended to a benzoquinolinato ligand (bq-NH2 or bq-NH(i-Pr)) in such a way that it can hydrogen bond to a ligand that is also bound to the metal. The effects of this two-point binding are studied. The complexes [(bq-NHR)IrH(L)(PPh3)2]BF4 (R = H, i-Pr) were synthesized where L = H2O, F. The hydrogen-bonding pattern in the water complex is probed by crystallographic, IR, and NMR studies. The fluoro complexes protonate at -90°C to give unstable hydrogen fluoride complexes, characterized by NMR (1JHF = 440 Hz, bq-NH2; 430 Hz, bq-NH(i-Pr)). Comparison with results for the corresponding bq-H and bq-CH3 species suggests that the hydrogen bonding provided by the pendant amino group is the key factor that allows stabilization of the HF complex, a previously unknown species. Crystal structures of an aqua and a fluoro derivative are reported.
