ISSN:
0009-2940
Keywords:
Cobalt complexes
;
Rhodium complexes
;
Iridium complexes
;
Ruthenium complexes
;
Pentamethylcyclopentadienyl
;
α-Aminoamide ligands
;
Glycinenitrile ligand
;
Peptide ester ligands
;
Aspartame
;
Asparagine
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Metal Complexes with Biologically Important Ligands, LXV[1]. - Chiral Half-Sandwich Complexes of Cobalt(III), Rhodium(III), Iridium(III), and Ruthenium(II) with α-Amino Amide, Glycinenitrile, and Peptide Ester LigandsCp*Co(CO)I2 (Cp* = η5-C5Me5), [(η6-arene)RuCl2]2 (arene = p-cymene, hexamethylbenzene), and [Cp*MCl2]2 (M = Rh, Ir) react with α-amino amides and various peptide esters to give the N,O-chelate complexes [Cp*(I)Co - NH2C(H)(R1)C(NHR2)-O]+ (1), [(η6-arene)(Cl)Ru - NH2C(H)(R1)C(NHR2)O]+ (2), and [CP*(Cl)M - NH2CH2C(NHR)O]+ (M = Rh, Ir) (5, in solution), respectively. In the solid state the ligands are η1N-bonded in 5. By deprotonation of the peptide bond in 2 and 5 the neutral N, N-chelate complexes (η6-arene)(Cl)Ru - NH2C(H)(R1)C(O)-N̊2 (6) and Cp*(Cl)M - NH2C(H)(R1)C(O)NR2 (M = Rh, Ir) (7) have been obtained. Glycinenitrile is η1-bonded in (η6-p-cymene)(Cl)2Ru(NH2CH2CN) (3) and Cp*(Cl)2Rh(NH2CH2CN) (4). Double deprotonated triglycine methyl ester is a N,N,N-tridentate ligand in (η6-C6Me6)Ru(NH2CH2C(O)NCH2C(O)-NCH2CO2Me) (8). The anions of L-asparagine and of aspartame (L-aspartyl-L-phenylalanine methyl ester) give the complexes 9-12 with tridentate O,N,O- or O,N,N-chelate ligands. The crystal structures of 1d (L = glyglyOEt), 5a (L = glycinamide), 6e (L = glyglyOEt), and 7k (L = glyglyglyOEt) have been determined by X-ray structural analysis.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19931260903
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