Synthesis,spectroscopic and crystal field studies on some azido-chromium(III)-pyridine complexes |
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| Affiliation: | 1. School of Radiation Medicine and Protection and Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, Jiangsu 215123, China;2. School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, Guangdong 510006, China;3. Department of Pharmacology, School of Basic Medicine, Wuhan University, Wuhan, Hubei 430072, China;4. Department of Obstetrics and Gynecology, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan |
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| Abstract: | The new complexes mer-Cr(py)3(N3)3, NaCr(py)4(N3)4, KCr(py)4(N3)4, and RbCr(py)3(N3)4 (py = pyridine) have been prepared. Infrared (4000-50 cm−1) and diffuse reflectance spectra (region 300-77 K) of powdered samples have been measured and discussed on bases of the known structures of these complexes. Single crystal absorption spectra for the mer-complex were obtained in the temperature range from 300 to 10 K revealing extensive vibronic structure associated with the 2Eg(Oh) and 2T1g(Oh) electronic origins. Crystal field calculations were used to assign the bands in the vibronic region and to obtain estimates for the crystal field and Racah parameters for this class of substances. The parameters found for the mer-complex at 10 K are 10 Dq = 17906 cm−1, B = 387 cm−1 and C = 3381 cm−1. |
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