تحضير الكاشفين DPIDBSA وMBDPI واستعمالهما في الدراسة التحليلية للايونات Co(II) , Ni(II) , Cu(II) بالطرق الطيفية == The Preparation And Use of The Two Reagents DPIDBSA And MBDPI In An Analytical Study of Ions Co(II) , Ni(II) , Cu(II) By Spectroscopic Methods
Author name:
زينب جاسم خضير الربيعي
Supervisor name:
سامي وحيد راضي الحسناوي
General topic:
Chemistry
Specific topic:
Chemistry
Degree:
Master
University:
University of Kufa - College Of Education For Girls - Chemistry Department
Language:
Arabic
University location:
Najaf
First pages:
25T1456 - p.pdf
Abstract:
تم تحضير مركبات دايمرات ازوبلورية سائلة بالصيغة الاتية : no.on n = 2 - 7و تشخيصها بالطراق الطيفية المتمثلة بطيف الاشعه تحت الحمراء وطيف الرنين النووي المغناطيسي للبروتون بالاضافة الى التحليل العنصر الدقيق وقد تبين من خلال التحليل الطيفي والتحليل العنصري | A new series of liquid crystal compound has been synthesized : no.on n=2 - 7 The identification of this new series had been done by IR and HNMR spectra in addition to C.H.N analysis. By using a hot stage polarizing microscope, it was found that the members n=2,3 show pure nematic phase and members n=4 - 7 show smectice (sc ) in addition to nematic phase. The effect of the number of carbon atoms on the side chains of the these compounds with TN - I shows odd - even effect transition temperatures was recognized. The TN - Sc show odd - even odd effect. The brodeniris groups (CH3) in terminal benzene rings decrease the transition temperature and has less effect on dimenshing the liquid crystalline properties than the monomers.
