engleski

Infrared spectra of aminophosphonic acids. II

Infrared spectra of diesters, monoesters and sodium salts of the monoesters of several new aminophosphonic acids containing benzeneazo group, e.g. derivatives of [a-(4-benzeneazoanilino)-N-benzyl] phosphonic acid, and [4-benzeneazo-a-(anilino)-benzyl]phosphonic acid, have been studied. Assignments for vibrations of the N-H, P=O, Po2-, P-0-H and P-0-R (R =Et, Bu) groups in these compounds were made. On the basis of the infrared spectra and determination of molecular weights of the monoesters, the molecular structure of the compounds is proposed. It was found that the site of the benzeneazo group in the molecule influences the properties of the monoesters. Thus, monoesters of [a-(4-benzeneazoanilino)- N-benzyl]phosphonic acid are dimers in chloroform solution, and are also associated, presumably dimeric, in the solid state, owing to strong hydrogen bonds between phosphoryl and acidic hydroxyl groups. Monoesters of [4-benzeneazo-a-(anilino)benzyl]phosphonic acid exist in the solid state as zwitterions.

infrared spectra ; aminophosphonic acids

Rad je tiskan uz moje djevojačko prezime Tušek, a trebao bi se vezati uz Božić Ljerku i matični broj 50922 (svi moji radovi nakon 1978. god. tiskani su uz prezime Tušek-Božić).