THE MECHANISM OF OCCURRENCE OF COOPERATIVE PROPERTIES IN CONJUGATE HYDROGEN-BONDS

The literature data on the change of v(HX) frequencies in hydrogen-bon ded complexes of different structure are analysed. It is shown that th e earlier found frequency dependencies can have a simple physical expl anation. It consists in the fact that the XH-bond of any molecule, apa rt from its proton-donor and proton-acceptor properties, also has cert ain transmission abilities. It means that when hydrogen bonds are conj ugated, to the proton-donor ability of any XH-group is always added a certain part (specific for this XH-group) of the proton-donor ability of the molecule, in relation to which this XH-group acts as a proton-a cceptor. Similarly, the proton-acceptor property of XH-group is increa sed by a certain part (specific for this XH-group) of the proton-accep tor ability of the molecule, in relation to which this XH-group acts a s the proton-donor. The dependence of the proton-donor (proton-accepto r) ability on the bend of the angle adjacent to the hydrogen bond is f ound.