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Coordination of metal ions by indolic acids. Complexes of indole-3-carboxylic,indole-3-acetic,indole-3-β-acrylic,indole-N-acetic and indole-N-methyl-2-carboxylic acids with some divalent metal ions |
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| Authors: | Paola Piu Vittorio Leoni M Antonietta Zoroddu Gavina Manca Salvatore Deiana Carlo Gessa |
| Institution: | 1. Dipartimento di Chimica, Università, Via Vienna 2, 07100, Sassari, Italy 2. Instituto C.N.R. per l'Applicazione delle Tecniche Chimiche Avanzate ai Problemi Agrobiologici, Via Vienna 2, 07100, Sassari, Italy 3. Istituto di Chimica Agraria, Università, Via E. De Nicola, Sassari, Italy |
| Abstract: | Complexes of formula M(L)2·nH2O M=Co or Ni; L=indole-3-carboxylic (I3CH), indole-3-acetic (I3AH), indole-N-acetic (INAH), indole-N-methyl-2-carboxylic (INMH) and M=Co or Ni and Cu, L=indole-3-β-acrylic acids (I3βH)] were pepared and characaterized by i.r. and electronic spectroscopy and by susceptibility measurements and e.s.r. at room and low temperature. The cobalt and nickel complexes exhibit a distorted octahedral coordination except the Co(I3C)2 complex for which a tetrahedral coordination was suggested. The Cu(I3β)2·H2O shows e.p.r. features that can be interpreted if the triplet state, S=1, depending on the temperature, is able to migrate through the crystal lattice of carboxylate dimers such as the copper(II) acetate monohydrate. |
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