Cobalt(III) complexes of amino alcohols. Structural consequences of protonation
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The crystal structure of the diprotonated form of cis-α-Δ-(-)589-[Co|(+)-PAHP)2en-δδγ]+ (PAHP = monoanion of 1-phenyl-2-amino-l,3-dihydroxypropane), Co(C9H12NO2H)2 (C2N2H8)C13-2H2O, has been determined by single-crystal X-ray diffraction methods. The crystals are orthorhombic, space group P212121 with a = 14.113 (2) Å, b = 18.782 (5) Å, c = 10.175 (2) Å, and Z = 4. Full-matrix least-squares refinement gave an R index of 0.044 for 2060 observed reflections with intensities greater than 3cr. The absolute configuration was determined by refinement of both enantiomorphs. The protonation sites were inferred to be the alcohol oxygens bonded to cobalt from the very short Cl-O interatomic distances. As a consequence, the Co-O and C-O bonds are lengthened. The effect of protonation upon other structural features is described. © 1983, American Chemical Society. All rights reserved.
author list (cited authors)
Clearfield, A., Rudolf, P., & Wardeska, J. G.