Coordinating properties of C2-symmetric chiral bis(oxazolinylpyridinyl)dioxolane ligands |
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Authors: | Bacchi Alessia Pelizzi Giancarlo Minardi Giovannina Pistuddi Angelo M. Solinas Costantino Chelucci Giorgio |
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Affiliation: | (1) Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica. Università di Parma, Parco Area delle Sciene 17/A, 43100 Parma, Italy;(2) Dipartimento di Scien, Università di Sassari, Via Muroni 23/a, 07100 Sassari, Italy;(3) Dipartimento di Chimica, Università di Sassari, Via Vienna 2, 07100 Sassari, Italy |
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Abstract: | Metal complexes of general formula M(L)X2 and M(L)X3 [L = (4S,5S)-2,2-dimethyl-4,5-bis{6-[(4,5-dihydro-4-(S)-(1-methylethyl)oxazol-2-yl)pyridin-2-yl]}-1,3-dioxolane] were obtained by reacting, respectively, CoII, CuII, NiII, and ZnII nitrate salts and the RhIII chloride salt, with a chiral C2-symmetric bis(oxazolinylpyridinyl)dioxolane (L) ligand, in MeOH/CHCl3 solution. A single crystal X-ray analysis was carried out on [Ni(L)(OH2)2](NO3)2 · 2H2O and the molecular structure of L was also determined. In the free ligand the two symmetric arms are essentially planar and oriented nearly perpendicular to the dioxolane average plane. In the Ni complex one seven-membered and two five-membered chelation rings are formed. The metal atom also lies on the C2 axis, and two symmetry-related water molecules complete the octahedral coordination environment. Both compounds crystallize in chiral space groups; the ligand crystallizes in orthorhombic system, space group C 2 2 21, Z = 4; the nickel complex crystallizes in tetragonal system, space group P 43 21 2, Z = 4. |
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