CONFORMATION, STRUCTURE, AND UV-VISIBLE AND CIRCULAR-DICHROISM SPECTRA OF COBALT(III) COMPLEXES OF 1-PHENYL-2-AMINO-1,3-DIHYDROXYPROPANES
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abstract
The ligands (1S,2S)-(+)-l-phenyl-2-amino-l,3-dihydroxypropane, C6H5CH(OH)CH(NH2)CH2OH, (+)-PAHPH, and (1R,2R)-(-)-l-phenyl-2-amino-l,3-dihydroxypropane upon reaction with hexanitrocobaltate(III) ion yielded Co-(PAHPH)(PAHP)2(NO2). Treatment of this complex with ethylenediamine plus chloride or iodide ion yielded green crystals of trans-Co(PAHP)2(en)C1.4H2O and purple crystals of the cis isomer. The latter compound was converted to Co-(PAHP)2(en)I-H2O. Crystals of this compound are orthorhombic with a = 6.786 (2) , b = 14.469 (2) , c = 24.807 (4) , and Z = 4. The space group is P2l2l2l. Intensity data (2677 reflections above background) were obtained with an automated counter diffractometer (CAD-4) by using the -2scan technique. The structure was solved by a combination of Patterson and Fourier methods. Refinement by full-matrix least-squares procedures led to a final R of 0.029 and weighted Rw of 0.042. The amino alcohol coordinates through the amino group and the O- on C1. Cobalt is octahedrally coordinated with the two ethylenediamine nitrogens and the alcohol oxygens forming the equatorial plane. The conformation is (). Spectral data are presented for all the compounds and used to delineate their conformations as well as provide information on protonation-deprotonation equilibria. 1979, American Chemical Society. All rights reserved.
