Glycinato complexes

The entry for the glycinato complex, which in the acidic solution bears a proton, provides a measure of the effects produced by a positive charge close to the scene of... 

The [Coen(C204)2]- ion shows a result similar to the glycinato complexes. In D20 + D+ broad NH and CH (12-cps) peaks are observed, whereas in D20 alone only a sharp C—H (3-cps) line occurs (Fig. 14). The C—H broadening in the first instance may be attributed to the coupling of the C—H and N—H protons. It appears from the sharp line observed in D20 that the conformation interchange for en is rapid in this instance > 100 sec-1. 

The methylene group of a-amino acid metal complexes such as the copper(II) glycinato complex is activated to some extent by the polarizing influence of the metal.46,47 Consequently, carban-ion-type reactions can be carried out at this position, while the amino and carboxyl groups are protected by coordination. These reactions cannot be performed on either the free ligand or the conjugate base. 

Figures 4 and 5 illustrate this point. The electronic lines in the facial tris(glycinato) complex are all more intense than the associated vibronic structure. This complex is fairly distant from centrosymmetry, because each amine group is nearly opposite a carboxylate. In the spectrum of the tris(ethylenediamine) complex, however, vibronic structure is more prominent. Though there is no actual inversion center, amines are nearly opposite amines, and the geometry is not far from centrosymmetric.

Photoisomerization also occurs for the bis(glycinato) complex", cis-Pt(gly)j. In HjO, the trans isomer is not photosensitive to LF excitation at 313 nm, but excitation of the cis isomer leads to cis-trans isomerization with a quantum yield of 0.13 ... 

H or CN R = C4H4 X = N, H, or S) have been described (see p. 357). Reaction of the glycinato-complex [PtCl(NH2CH2C02XPBti3)] with aldehydes or alkylating agents leads to a variety of chelated substituted a-amino-acid complexes (Scheme... 

Co(gly)3 (L-asp)J Stereoselective formations of diastereoisomers from L-aspar-tato-glycinato complexes, [Co(gly)3 (L-asp) ] " (n = 1, 2, 3), were investigated by Kawasaki et al. isomer compositions of mer and fac for A and A were determined in an aqueous reaction mixture of [CoC03(gly)2] , L-aspartate, and activated charcoal at 40 50°C. The results are cited in Table 4.4. Marked stereoselectivity (more than 90%) is found in every fac-A isomer, appreciable selectivity ca. 70%) being found in every mer-A isomer. 

The CD spectral data of the (—)j89-glycinato complex is cited in Table 5.6. The so-called additivity rule of the configurational and vidnal contributions permitted to find that the configurational curves for the diastereomeric complexes are similar to the CD curve for the enantiomeric glycinato complex. 

New problems on structure of cisplatin from number of known isomers, resonance structures of acetylacetonate and glycinate, structures of glycinato complexes, complexes of the ambidentate thiocyanato complexes, structure of a trien complex, and names of the Figure 3.18 complexes... 

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