A general mechanism for metal ion incorporation into porphyrin molecules

1972 ◽  
pp. 13 ◽  
Author(s):  
R. Khosropour ◽  
P. Hambright
Keyword(s):  
Metal Ion ◽  
General Mechanism ◽  
Ion Incorporation

Metal Ion Incorporation Reactions of the Cluster [Fe3S4(LS3)]3-, Containing the Cuboidal [Fe3S4]0Core

1997 ◽  
Vol 119 (27) ◽  
pp. 6242-6250 ◽  
Author(s):  
Jian Zhou ◽  
James W. Raebiger ◽  
Charles A. Crawford ◽  
R. H. Holm
Keyword(s):  
Metal Ion ◽  
Ion Incorporation

Ion Exchange Effects in Porous Silicon

1993 ◽  
Vol 298 ◽  
Author(s):  
B. Matvienko ◽  
P. Basmaji ◽  
V. Grivickas ◽  
A. Bernussi
Keyword(s):  
Porous Silicon ◽  
Ion Exchange ◽  
Luminescence Spectrum ◽  
Metal Ion ◽  
Blue Shift ◽  
Alkaline Metal ◽  
Anodic Etching ◽  
Exchange Effects ◽  
Zeolite Type ◽  
Ion Incorporation

AbstractWe report an effect of alkaline metal ion incorporation into porous silicon (PS) structure from the electrolyte during anodic etching. Blue shift of the whole luminescence spectrum was obtained as a consequence of ion incorporation. We suggest the presence of zeolite-type structures in PS, as an explanation to the observed properties.

scholarly journals The pyridoxal- and pyridoxal 5′-phosphate-catalysed non-enzymic degradations of l-serine O-sulphate and related compounds

1968 ◽  
Vol 110 (4) ◽  
pp. 687-692 ◽  
Author(s):  
J H Thomas ◽  
K S Dodgson ◽  
N. Tudball
Keyword(s):  
Schiff Base ◽  
Hydrogen Atom ◽  
Metal Ion ◽  
Reaction Rates ◽  
General Mechanism ◽  
Amino Group ◽  
Keto Acid ◽  
Spectral Changes ◽  
Number Of Factors ◽  
Related Compounds

1. l-Serine O-sulphate and l-threonine O-sulphate are degraded in the presence of pyridoxal 5′-phosphate to yield equimolar amounts of the corresponding keto acid, ammonia and sulphate. 2. Pyridoxal catalyses the same reactions at a faster rate. 3. One of a number of bi- or ter-valent metal ions must be present for these degradations to proceed. The reaction rates are dependent on a number of factors including pH and the nature of the metal ion used. 4. Studies with related sulphate esters indicate that the α-hydrogen atom and the amino group are essential for activity. 5. Spectral changes during the pyridoxal and pyridoxal 5′-phosphate catalysis of l-serine O-sulphate breakdown suggest the formation of a Schiff base. 6. The mechanism for these reactions appears to be in accordance with the general mechanism proposed for pyridoxal-catalysed αβ-elimination reactions.

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