Complexes of chromium(III), cobalt(II) and copper(II) with sulphur or oxygen and nitrogen donors

1987 ◽  
Vol 12 (2) ◽  
pp. 128-130 ◽  
Author(s):  
Pilar Souza ◽  
Fabi�n S�nchez-Kaiser ◽  
Jos� R. Masaguer ◽  
Agueda Arquero
Keyword(s):  
Nitrogen Donors

The formation constants of some metal complexes with 3-Acetyl-4-hydroxycoumarin, dehydroacetic acid, and their oximes

1971 ◽  
Vol 24 (5) ◽  
pp. 925 ◽  
Author(s):  
GCS Manku
Keyword(s):  
Metal Complexes ◽  
Sodium Perchlorate ◽  
Formation Constants ◽  
Ionic Concentration ◽  
Dehydroacetic Acid ◽  
Nitrogen Donors ◽  
Oxygen Donors

The formation constants (K1, K2, and β2) of the complexes of 3-acetyl-4- hydroxycoumarin (ahc) and dehydroacetic acid (dha) and their respective oximes, ahco and dhao, with iron(II), cobalt(II), nickel(II), copper(II), zinc(II), calcium(II), magnesium(II), cadmium(II), dioxouranium(VI), iron(III), aluminium(III), scandium(III), indium(III), yttrium(III), and lanthanon(III) ions (lanthanum to lutetium inclusive with the exception of promethium) have been determined pH-metrically at 35� in 50% v/v aqueous dioxan medium with 0.100M sodium perchlorate as the constant ionic concentration, using Calvin and Wilson's pH-metric technique. The trends in the formation constants of these complexes are discussed. It is observed that, except in the case of Co2+, Ni2+, and Cu2+ ions, for which chelation through nitrogen donors is more favoured, all other ions prefer coordination through oxygen donors.

scholarly journals Hydrogen Bonds between Nitrogen Donors and the Semiquinone in the Qi-site of thebc1Complex

2007 ◽  
Vol 282 (35) ◽  
pp. 25831-25841 ◽  
Author(s):  
Sergei A. Dikanov ◽  
J. Todd Holland ◽  
Burkhard Endeward ◽  
Derrick R. J. Kolling ◽  
Rimma I. Samoilova ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Nitrogen Donors
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