| Autor: |
Vitko M Ristanović, Narumi Sakagami, Sumio Kaizaki, Dušan J. Radanović |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
Inorganica Chimica Acta. 292:16-27 |
| ISSN: |
0020-1693 |
| DOI: |
10.1016/s0020-1693(99)00164-4 |
| Popis: |
Structural data are given for two recently reported hexadentate chromium(III) complexes: trans(O5)-Na[Cr(ed3ap)]·3H2O (A) and Na[Cr(u-eddadp)]·3H2O (B) (ed3ap=ethylenediamine-N,N,N′-triacetate-N′-3-propionate ion; u-eddadp=ethylenediamine-N-diacetate-N′-di-3-propionate ion). Only one, the favored (trans(O5)) isomer of the complex A was resolved. Also, the complex A was found to be spontaneously resolved. The absolute configuration around the chromium(III) ion in the crystal A has been determined to be Λ(ΛΔΛ). The complexes crystallize in the space group P212121 (for A) and Pna21 (for B) of the orthorhombic crystal system. Final R values are 0.045 for A and 0.078 for B. The conformations of the chelate rings are found to be the envelope for the glycinate rings (R relatively flat and G with a significant deviation) and distorted skew-boat (half-chair) for the β-alaninate rings. Structural parameters and strain analysis data of complexes A and B and related [Cr(edta-type)]− chelates are compared and discussed in relation to the structure of the ligand and octahedral distortion of complexes. The CD spectra of the Λ-(−)589-trans(O5)-[Cr(ed3ap)]− (A) and the other edta-type Cr(III) complexes have been correlated and discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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