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

Abstract

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.