Results 251 to 260 of about 23,086 (291)

The pK of Schiff base deprotonation in bacteriorhodopsin

Biochemical and Biophysical Research Communications, 1978
Abstract Kinetic resonance Raman spectroscopy as a function of pH has been utilized to determine the pK of Schiff base deprotonation during the bacteriorhodopsin photochemical cycle. It is shown that the pK of Schiff base deprotonation is between 9.9 and 10.3, microseconds after light absorption and is >12 before photon initiation of photochemical ...
B, Ehrenberg, A, Lewis
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Some aspects of schiff bases of retinaldehyde

Experimental Eye Research, 1974
Abstract We have previously described an entity, which we have named Complex II, formed from retinaldehyde (RET) (any isomer) and ethanolamine-phosphoglyceride (EPG) which contains unsaturated fatty acid components. Complex II exhibits a 500-nm absorbance maximum in a spectrum similar to that of mammalian rhodopsin.
R G, Adams, N E, Sharpless, W H, Jennings   +2 more
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Schiff Base Complexes of Boron: Boron Complexes of Schiff Bases of 2,4-Pentanedione

Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 1978
Abstract Tetra-coordinated diacetoxy-boron Schiff base derivatives of the type (AcO)2B(SB) (where SB− is the anion of the corresponding monofunctional bidentate Schiff base, SBH) have been synthesized in almost quantitative yields and in a state of sufficient purity by the equimolar ratio reactions of boric acid and Schiff bases in acetic anhydride ...
H. B. Singh, J. P. Tandon
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Schiff base compounds as artificial metalloenzymes

Colloids and Surfaces B: Biointerfaces, 2022
Much research has been done on traditional homogeneous metal catalysts and enzymatic catalysts, but recently a new class of hybrid catalysts called synthetic (artificial) metalloenzymes has been considered by researchers. Metalloenzymes as hybrid catalysts (host-guest systems) have been shown that combine the properties of a homogeneous and also ...
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Structure of a novel, macrocyclic Schiff base

Acta Crystallographica Section C Crystal Structure Communications, 1988
(E,E)-1,2,3,4,4a alpha, 12a beta-Hexahydro-7,7,10,- 10-tetramethyl-7H,10H-8,9-dithia-5,12-diazabenzo-cyclodec ene, C14H24N2S2, Mr = 284.49, monoclinic, P2(1)/n, a = 8.962 (1), b = 19.356 (3), c = 10.178 (1) A, beta = 114.49 (1) degrees, V = 1606.7 (7) A3, Z = 4, Dm = 1.21 (1), D chi = 1.176 Mg m-3, mu (Mo K alpha, lambda = 0.71073 A) = 0.31 mm-1, F(000)
P K, Bharadwaj, J A, Potenza, H J, Schugar   +2 more
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Synthesis and Properties of Carbocyclic Schiff Bases.

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Yu. V. Popov, T. K. Korchagina, G. V. Chicherina, T. A. Ermakova   +3 more
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Synthesis of acyclic dinucleating Schiff base-pyridine and schiff base-phosphine ligands

Tetrahedron Letters, 1995
Abstract 5-tert-butyl-3-pyridyl-salicyaldehyde and 5-tert-butyl-3-diphenylphosphino-salicyaldehyde have been synthesized from 4-tert-butylphenol in good overall yields. Condensation of the salicyaldehydes with 2,3-diamino-2-3-dimethylbutane afforded the desired dinucleating Schiff base-pyridine and Schiff base-phosphine ligands respectively.
Fung Lam, Kin Shing Chan
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Schiff bases. Part III. Amine and ketone exchange reactions with Schiff bases

Journal of the Chemical Society C: Organic, 1968
Certain ketimines of the type R12 CN–CHR22 undergo amine exchange when heated with diphenylmethylamine to give the ketimines R12CN–CHPh2, which rearrange to the tautomers R12CH–NCPh2. These undergo a second amine exchange with the production of N-(diphenylmethylene)diphenylmethylamine.
Alexander Lawson, J. O. Stevens
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Uranyl stabilized Schiff base complex

Chemical Communications, 2007
Uranyl Schiff base complex [(UO(2))(2)(Salpro)(OH)(Solvent)(2)] (1) in the presence of excess of ethylenediamine (EDA) does not undergo nucleophilic addition (hydrolysis) and substitution (transamination) reactions due to an extended chelation [2N, 3O + OH] by the flexible backbone.
Mohan S, Bharara, Stephen A, Tonks, Anne E V, Gorden   +2 more
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Polymeric Schiff Bases. III. Some Prototype Exchange Reactions of Schiff Bases

Journal of Macromolecular Science: Part A - Chemistry, 1967
Abstract The amine moiety in Schiff bases can be exchanged quantitatively by another amine to yield new Schiff bases if the volatility of the replacing amine is lower than the derived amine, thereby allowing the latter to distilled from the reaction mass. This amine exchange was shown to be quantitative also for diamines and di-Schiff bases. Similarly,
G. F. D'alelio, J. V. Crivello, T. Kurosaki, R. K. Schoenig   +3 more
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