Datta V. Naik

A study of the absorption and fluorescence spectra of rivanol.

Abstract The electronic absorption and fluorescence spectra of the antibacterial 2-ethoxy-6,9-diaminoacridine lactate (rivanol) were studied as a function of pH and Hammett acidity. The dissociation of the doubly charged cation results in an unusual shifting pattern in the absorption and fluorescence bands. This is shown, by polarized excitation spectroscopy and low-temperature conventional emission spectroscopy, to be due to configurational reorganization in the excited state involving the amino groups. The doubly charged cation can be detected by its native fluorescence in concentrations as low as 20 pg ml−1.

The novel structure of a polymeric iron(II) compound with an unusually large mössbauer quadrupole splitting

Abstract The crystal structure of Fe(NH2NH CS NH2)2SO4 has been determined. Although the crystal contains both cis- and trans-Fe(NH2NH CS NH2 units bridged by SO4 ions, the Mossbauer spectrum consists of only two reasonably sharp lines, with the largest reported quadrupole splitting of an Fe(II) complex.

Simplified fluorimetric determination of digitalis alkaloids

Abstract A new fluorimetric procedure for the determination of digoxin and digitoxin is described. The method is based upon the development of a fluorophore when the digitalis drugs are treated with concentrated sulfuric acid. Applications to tablet and elixir forms of the drugs are described.