Thermodynamic studies of 2-(5-bromo-2-pyridylazo)-5-diethylamino)phenol Cu(II), Co(II), Ni(II) and Zn(II) complexes

Three new methods of preparation based on reactions of pyrylium salts with primary amines, acylation of polyamines with activated carboxyl derivatives of cyanine dyes, diisocyanate with aminoderivatives of cyanine dyes were used to obtain fluorescent homodi- and, for the first time, homotrimer cyanine dyes. Spectral-luminescent properties of synthesized dyes and their nucleic acid complexes were studied.