Document Details

Document Type : Thesis 
Document Title :
Structure conformation analysis of cyclic and acyclic formazans and some of their complexes using molecular orbital theory
التحليل التركيبي لمركبات الفورمازان الحلقية وغير الحلقية وبعض متراكباتها باستخدام نظرية المدارات الجزيئية
 
Document Language : Arabic 
Abstract : Formazans are the compounds which contain the azohyrdazone system of conjugated double bonds. Initial applications of these compounds included the dye industry and histochemistry , where their ease of oxidation to the corresponding tetrazolium salt accompanied by distinctive color changes was invaluable in cell staining . Formazans are , also of interest because of their importance in analytical chemistry , biology , agriculture and industry as well as complexing . They are also used in the determination of the effects of anti cancer drugs and determine the activity of tumor cells . Formazans are both tautomerically and conformationally labile and can exist as chelate; syn,s-cis , semi-open; syn,s-trans and open forms; anti,s-cis , anti,s-trans isomers . Formazans are colored compounds due to the π- π* transitions . The study of the structure , tautomeric , and photochromic isomers of formazans is important . In recent years crown formazans have been much studied due to their interesting chelate structures which can be utilized as ion selective electrodes due to the presence of holes in their structures . The applications of crown formazans in selective metal extraction and determination depend mainly on their ability to form complexes with metal cations . The cavity size of crown formazans as well as substituents on the macrocyclic ring play an important role in their complexing abilities and should then affect on the stability of their metal complexes . It is important to pinpoint and understand essential phenomena and applications of open and crown-formazans and the factors controlling them . For these reasons , this thesis was suggested aiming to ; 1 - Study the photochromism and isomerization of the formazans . 2- Investigate the various factors influencing the photochromic properties of formazans , such as size , type and position of substituents as well as the solvent polarity . 3- Give details of the ground state properties of formazans . 4- Study the conformational behavior of macrocyclic formazans as well as the ground state properties of macrocyclic formazans . 5- Explore the effect of cavity size and substituents on the conformation of crown formazans . 6- Account for the chelation and metal complexing power and selectively of the crown formazans 
Supervisor : Adel Ahmed Mohamed 
Thesis Type : Doctorate Thesis 
Publishing Year : 1432 AH
2011 AD 
Number Of Pages : 297 
Added Date : Sunday, March 2, 2014 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
فاتن عبدالمحسن الجفريAl-jiffrey, Faten Abdul MohsenInvestigatorDoctorate 

Files

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 36624.pdf pdf 
 36625.pdf pdf 

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