Geometric Isomers of Cobalt(II) and Cobalt(III) Picolinates in Solution |
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| Authors: | Novitski G Silagi-Dumitresku I Paraskivesku A Gulya A |
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| Institution: | (1) Moldova State University, ul. Matteevicha 60, Chisinau, 277009, Moldova;(2) Babesh-Boliai University, Cluj-Napoca, Romania;(3) Al. I. Kuza University, Iasi, Romania |
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| Abstract: | Cobalt complexes with picolinic acid (HPic), namely, CoII(Pic)2(H2O)2] · 2H2O (I) and CoIII(Pic)3] · H2O (II) are studied using 1H and 13C NMR spectroscopy. Compound Iexists in solution as three geometric isomers, namely, trans-trans-trans, cis-trans-cis, and trans-cis-cis(molar ratio 4 : 2 : 1, respectively). According to 13C NMR data, compound IIexists in solution as a mer-isomer. The relative energy stability of the isomers was estimated using the molecular mechanics method. |
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