Low Temperature Physics: 32, 148 (2006); https://doi.org/10.1063/1.2171517 (10 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 2 (February 2006), p. 201-213    ( to contents , go back )

H-bonded complexes of 2-aminopyrimidine-parabenzoquinone in an argon matrix

A.M. Plokhotnichenko1, S.G. Stepanian1, L. Adamowicz2, and V.A. Karachevtsev1

1B. Verkin Institute for Low Temperature Physics and Engineering of the National Akademy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: plokhotnichenko@ilt.kharkov.ua

2Chemical Faculty, University of Arizona, Tucson, Arizona, 85721, the USA

Received May 17, 2005, revised September 7, 2005

Abstract

The IR spectroscopy method was used to study H-bonded complexes of 2-aminopyrimidine NH2Py with parabenzoquinon Qu in a low-temperature argon matrix. The IR absorption spectra of these compounds were obtained in the spectral range 400–3600 cm–1 at various concentration ratios at T = 11 K. The molar integral absorption coefficients in the bands of stretching vibrations of the free and H-bonded NH2 groups were determined. The quantum-mechanical calculations of the IR spectra of the NH2Py and Qu molecules and their dimers were performed. Comparison of the experimental and calculated data suggests that the NH2Py–Qu dimers in the argon matrix have a planar structure with two weak hydrogen bonds NH····O and CH····N.

PACS:
82.30.Nr - Association, addition, insertion, cluster formation

Key words: 2-aminopyrimidine, parabenzoquinone, matrix isolation, IR spectra, hydrogen bond, dimers

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