By A. Braibanti (auth.), A. Braibanti (eds.)
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Extra resources for Bioenergetics and Thermodynamics: Model Systems: Synthetic and Natural Chelates and Macrocycles as Models for Biological and Pharmaceutical Studies
0 Figure 3. Effect of L-histidine on the supernatant distribution of Ni(II) in dialyzed serum at various Ni(II): albumin ratio. Dialyzed serum + L-histidine, e---e; Dialyzed serum 0---0. The equilibrium existing between Ni(II)-L-histidine and Ni(II)-albumin may have important biological significance. The Ni(II)-L- histidine complex, which is a much lower order of molecular size than Ni(II)-albumin complex, may mediate transport through biological membrane by virtue of the equilibrium between these two molecular species of Ni(II).
3(3), pp. 156-180. : 1971, Trace Elements in Human and Animal Nutrition, p. , Academic Press, New York. DESIGN AND SYNTHESIS OF LIGANDS Jean-Pierre Sauvage Institut Le Bel, Universite Louis Pasteur, 4 Rue Blaise Pascal, Strasbourg, France Macropolicyclic molecules contain intramolecular cavities enabling these molecules to form inclusion complexes with given substrates. In addition to selective complexation of substrates, these macropolicycles may perform chemical activation and/or transport of the bound substrate.
In particular, will form stable complexes with substituted 1 ammonium chlorides such as those derived from Me3CNH2, Me2CHCH2NH2, Me2CHCH2CH2NH2, C6HllNH2 (cyclohexylamine), HONH2, H2NNH2, and H~CCH2NH2. ) space-filling molecular models, led Cram (7) to propose a three-point binding model for the face-to-face complex formed between l8-crown-6 (2) and a RNH3+ cation. lS0 O \ 0'" .... H .. H..... + '. ~O~'o o the Me3CNH3+ ion. It is en~isaged that the three hydrogens on the positively charged nitrogen of the Me3CNH3+ ion form hydrogen bonds to alternate oxygens in (~) leaving the other three oxygens to contribute some additional ion-dipole stabilisation to the complex.
Bioenergetics and Thermodynamics: Model Systems: Synthetic and Natural Chelates and Macrocycles as Models for Biological and Pharmaceutical Studies by A. Braibanti (auth.), A. Braibanti (eds.)