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Synthesis, Crystal Structure and Vibrational Spectrum of Cobalt(II)orotate Trihydrate, [Co(C5

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Synthesis, Crystal Structure and Vibrational Spectrum of Cobalt(II)orotate Trihydrate, [Co(C

5

N

2

O

4

H

2

) · 3 H

2

O

Wolfgang Brockner, Robert Branscheid, Mimoza Gjikaj, and Arnold Adam Institute of Inorganic and Analytical Chemistry, Clausthal University of Technology, Paul-Ernst-Straße 4, D-38678 Clausthal-Zellerfeld, Germany

Reprint requests to Prof. Dr. A. Adam. Fax + 49 (0)5323 / 72-2995.

E-mail: arnold.adam@tu-clausthal.de

Z. Naturforsch. 60b, 175 – 179 (2005); received September 20, 2004

Cobalt orotate trihydrate, [Co(C5N2O4H2)]·3H2O, has been synthesized and its crystal structure determined. The title compound crystallizes in the orthorhombic space group P212121(no. 19) with a=771.5(2), b=788.9(7), c=1470.4(2)pm, and Z=4. Bridging orotate anions coordinate in a mono- and bidentate manner to the Co atom resulting in infinite chains of alternating Co(II) cations and orotate (OrH2−) anions parallel to the c axis. The distorted octahedral Co coordination geometry is completed by three H2O molecules. The FT-Raman and FT-IR spectra of the crystalline compound have been recorded and an assignment of the vibrational modes is proposed. The thermal behavior (TG) was investigated.

Key words: Cobalt(II)orotate Trihydrate, Crystal Structure, Vibrational Spectrum, Thermal Behavior

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