Metal complexes of peptides containing monodentate or chelating imidazole nitrogen donors: Factors influencing the coordination of amide groups and imidazole side chains

2002 ◽  
Vol 23 (2) ◽  
pp. 149-178 ◽  
Author(s):  
Imre SóvÁGÓ ◽  
Katalin Várnagy ◽  
Katalin Ősz
Keyword(s):  
Metal Complexes ◽  
Side Chains ◽  
Factors Influencing ◽  
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.

Discotic liquid crystals of transition metal complexes X. Phthalocyanine derivatives substituted withn-alkyloxyphenyl side chains

1991 ◽  
Vol 10 (3) ◽  
pp. 357-368 ◽  
Author(s):  
Kazuchika Ohta ◽  
Takuya Watanabe ◽  
Satoshi Tanak ◽  
Testsuya Fujimoto ◽  
Iwao Yamamoto ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Side Chains ◽  
Discotic Liquid Crystals

A new family of bent-core C2-symmetric liquid crystals

2010 ◽  
Vol 88 (7) ◽  
pp. 639-645 ◽  
Author(s):  
Kyle A. Hope-Ross ◽  
Paul A. Heiney ◽  
John F. Kadla
Keyword(s):  
Differential Scanning Calorimetry ◽  
Small Angle ◽  
Liquid Crystalline ◽  
Side Chains ◽  
Scanning Calorimetry ◽  
X Ray ◽  
New Family ◽  
X Ray Scattering ◽  
Factors Influencing ◽  
Liquid Crystalline Phases

A series of C2-symmetric compounds with different core sizes and varying lengths and numbers of alkoxy side chains were prepared, and the factors influencing their liquid crystalline mesophase behaviour were investigated. The compounds studied were based on benzophenone, dibenzylidene-acetone, and 1,9-diphenyl-nona-1,3,6,8-tetraen-5-one cores with either 1 or 2 linear alkoxy side chains. The side chains were varied in length from C6H13 to C12H25. The liquid crystalline mesophase behaviour of the compounds was investigated using differential scanning calorimetry, polarizing optical microscopy, and small-angle X-ray scattering (SAXS). It was found that a number of the molecules were able to self-assemble into smectic and nematic liquid crystalline phases.

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