Proton and Li+ polarizability of systems with intramolecular fluctuation of H+ or Li+ between four N or NO acceptors. An infrared-spectroscopic investigation of hydrogen and Li+ bonds

Bases with four N or NO acceptor groups have been studied by infrared spectroscopy as free bases and H+ or Li+ monosalts in solution. The following compounds were investigated: 1,2-bis[2,2-bis(2-pyridyl)ethyl]benzene (compound 1) as HAuCl4 and LiClO4 monosalts, 1,2-bis[2,2-bis(dimethylamino)ethyl]benzene (compound 2) as LiClO4 monosalt and 1,2-bis[2,2-bis(2-pyridyl)ethyl]benzene tetra-N-oxide (compound 3) as LiClO4 monosalt.The proton fluctuates between the four N acceptors of the HAuCl4 monosalts of compound 1 and this motion causes large proton polarizability. All the N acceptors are influenced by the proton to the same extent. In the case of the LiClO4 monosalts of compounds 2 and 3, the Li+ ion fluctuates between the four NO acceptors causing large Li+ polarizability. In the case of the LiClO4 monosalt of compound 1 the Li+ ion fluctuates only between two N acceptors.