ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Physicochemical investigation of 2-hydroxyl-1-naphthaldehyde thiosemicarbazone

R. Rusina and A. Sirota

Komenský University, Bratislava

Abstract: The yellow color of 2-hydroxy-1-naphthaldehyde thiosemicarbazone (I) in the alk. range was studied by the spectrophotometric method. It was detd. that the shift to higher pH of the absorption max. spectra of I in the visible spectral region is caused by the dissocn. of the OH group in the o-position with the formation of an anion and a conjugated system in the side chain. The value of the dissocn. const. of the OH group in the o-position was detd. by the potentiometric method. By the measurement at 20° in 40% (vol.) Me₂CO, the value was calcd.: K = 4.5 × 10^-10. I reacts with the metal cations Co²⁺, Cu²+, Ni²⁺, Ag⁺, and Hg²⁺ with the formation of colored asymmetric bicyclic inner complex compds. Some phys.-chem. properties of the agents can be applied in anal. chem.

Full paper in Portable Document Format: 205a366.pdf (in Slovak)

Chemical Papers 20 (5) 366–372 (1966)