Crystal structures of two mononuclear complexes of terbium(III) nitrate with the tripodal alcohol 1,1,1-tris-(hy-droxy-meth-yl)propane
| Autor: | Jaísa F. Soares, Giovana G. Nunes, Thaiane Gregório, David L. Hughes, Siddhartha O. K. Giese |
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| Rok vydání: | 2017 |
| Předmět: |
Lanthanide
crystal structure Coordination sphere Denticity lanthanide Stereochemistry chemistry.chemical_element mononuclear Terbium Crystal structure terbium(III) 010402 general chemistry 01 natural sciences tripodal alcohol Research Communications lcsh:Chemistry chemistry.chemical_compound nitrate General Materials Science Coordination geometry 010405 organic chemistry Hydrogen bond General Chemistry Condensed Matter Physics 0104 chemical sciences Crystallography lcsh:QD1-999 chemistry terbium(III) Methyl group |
| Zdroj: | Acta Crystallographica Section E: Crystallographic Communications Acta Crystallographica Section E: Crystallographic Communications, Vol 73, Iss 2, Pp 278-285 (2017) |
| ISSN: | 2056-9890 |
| Popis: | Two new mononuclear complexes of ten- and nine-coordinate terbium(III) were synthesized from Tb(NO3)3·5H2O and the tripodal alcohol 1,1,1-tris(hydroxymethyl)propane (H3 L Et) to be employed as potential building blocks for heterometallic 3d–4f block metal aggregates. Two new mononuclear cationic complexes in which the TbIII ion is bis-chelated by the tripodal alcohol 1,1,1-tris(hydroxymethyl)propane (H3 L Et, C6H14O3) were prepared from Tb(NO3)3·5H2O and had their crystal and molecular structures solved by single-crystal X-ray diffraction analysis after data collection at 100 K. Both products were isolated in reasonable yields from the same reaction mixture by using different crystallization conditions. The higher-symmetry complex dinitratobis[1,1,1-tris(hydroxymethyl)propane]terbium(III) nitrate dimethoxyethane hemisolvate, [Tb(NO3)2(H3 L Et)2]NO3·0.5C4H10O2, 1, in which the lanthanide ion is 10-coordinate and adopts an s-bicapped square-antiprismatic coordination geometry, contains two bidentate nitrate ions bound to the metal atom; another nitrate ion functions as a counter-ion and a half-molecule of dimethoxyethane (completed by a crystallographic twofold rotation axis) is also present. In product aquanitratobis[1,1,1-tris(hydroxymethyl)propane]terbium(III) dinitrate, [Tb(NO3)(H3 L Et)2(H2O)](NO3)2, 2, one bidentate nitrate ion and one water molecule are bound to the nine-coordinate terbium(III) centre, while two free nitrate ions contribute to charge balance outside the tricapped trigonal-prismatic coordination polyhedron. No free water molecule was found in either of the crystal structures and, only in the case of 1, dimethoxyethane acts as a crystallizing solvent. In both molecular structures, the two tripodal ligands are bent to one side of the coordination sphere, leaving room for the anionic and water ligands. In complex 2, the methyl group of one of the H3 L Et ligands is disordered over two alternative orientations. Strong hydrogen bonds, both intra- and intermolecular, are found in the crystal structures due to the number of different donor and acceptor groups present. |
| Databáze: | OpenAIRE |
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