Three am ino acid analogues o f citric acid siderophores were synthesized. The synthetic strategy involved condensation o f 2-ter/-butyl-l,3-di(N -hydroxysuccinim idyl) or 2-tert-buiy\l,3-bis(pentachlorophenyl)citrates with N -ethyl-co-am inoalkylhydroxam ates. The exam ina­ tion o f biological properties o f the obtained com pounds revealed their poor, if any siderophore activity and thus conf...

The title complex, K2[Ni2(C6H5O7)2(H2O)4]·4H2O, is a dinuclear centrosymmetric anionic octa-hedral complex, involv-ing citrates as tridentate and bridging ligands, and coordinating water mol-ecules. An extensive network of hydrogen bonds connects the complex anions through the two unique uncoordinating water mol-ecules. The K(+) counter cation is surrounded by seven O atoms in the form of an ir...

Since the postulation by Greenwald (1) of a citrate-like substance in blood, capable of holding calcium in a non-ionized form, the behavior of calcium in the presence of citrate has received considerable attention from investigators primarily interested in the state of calcium in the living organism. The subject has also assumed considerable importance in the field of the chemistry of milk. The...

The possible origin of luminescent properties of biodegradable photoluminescent polyesters (BPLPs) has been revealed by isolation and identification of luminescent agent from the hydrolyzate of BPLP. Elemental analysis, ESI-MS, (1)H, (13)C, 2D HSQC and COSY NMR spectra confirmed the chemical structure as 5-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyridine-3,7-dicarboxylic acid (TPA).