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Solid-state linear polarized IR-spectroscopy of croconic and rhodizonic acids

100%

Kolev T., Koleva B., Spiteller M.

Open Chemistry

2008

vol. 6

issue 3

393-399

The applications of linear-polarized IR-spectroscopy to oriented colloid suspensions in a nematic host are demonstrated with croconic and rhodizonic acids. The experimental IR vibrational assignments of the solid-state of both neutral compounds are presented. Assignments are supported by theoretical quantum chemical calculations and vibrational analysis at the DFT level of theoretical approximation with the 6-311++G** basis set. [...]

Crystal structure and spectroscopic properties of 4-acetaminopyridine and its protonated form

76%

Koleva B., Nikolova R., Tchapkanov A., Kolev T., Mayer-Figge H., Spiteller M., Sheldrick W.

Polish Journal of Chemical Technology

2009

vol. 11

issue 3

35-40

4-Acetaminopyridine dihydrate and its protonated form, stabilized as the hydrochloride salt have been synthesized and spectroscopic elucidated in solution and in the solid-state by means of the inear-polarized solid state IR-spectroscopy (IR-LD), UV-spectroscopy, TGA, DSC, and the positive and negative ESI MS. Quantum chemical calculations were used to obtain the electronic structure, vibrational data and the electronic spectra. The spectroscopic and theoretical data are compared with the structure of the first compound obtained by single crystal X-ray diffraction. The effect of Npy protonation on the optical and magnetic properties of a 4-acetaminopyridine is discussed.

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1 Open Chemistry

1 Polish Journal of Chemical Technology

1 2009

1 2008

2 Kolev T.

2 Koleva B.

2 Spiteller M.

1 Mayer-Figge H.

1 Nikolova R.

1 Sheldrick W.

1 Tchapkanov A.

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Solid-state linear polarized IR-spectroscopy of croconic and rhodizonic acids

Crystal structure and spectroscopic properties of 4-acetaminopyridine and its protonated form