Effect of polarity and orientation of substituents on the mesophase behavior of some newly prepared bilaterally substituted liquid crystals / (Record no. 65760)
[ view plain ]
| 000 -LEADER | |
|---|---|
| fixed length control field | 03068cam a2200337 a 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | EG-GiCUC |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20250223031953.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 180405s2017 ua dho f m 000 0 eng d |
| 040 ## - CATALOGING SOURCE | |
| Original cataloging agency | EG-GiCUC |
| Language of cataloging | eng |
| Transcribing agency | EG-GiCUC |
| 041 0# - LANGUAGE CODE | |
| Language code of text/sound track or separate title | eng |
| 049 ## - LOCAL HOLDINGS (OCLC) | |
| Holding library | Deposite |
| 097 ## - Thesis Degree | |
| Thesis Level | M.Sc |
| 099 ## - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | Cai01.12.10.M.Sc.2017.Mo.E |
| 100 0# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Mohamed Hamed Ali Mohamed |
| 245 10 - TITLE STATEMENT | |
| Title | Effect of polarity and orientation of substituents on the mesophase behavior of some newly prepared bilaterally substituted liquid crystals / |
| Statement of responsibility, etc. | Mohamed Hamed Ali Mohamed ; Supervised Abdelgwad A. Fahmi , Magdi M. Naoum |
| 246 15 - VARYING FORM OF TITLE | |
| Title proper/short title | تأثير قطبية و اتجاه المجموعات العرضية المستبدلة على سلوك طور الوسط لبعض البللورات السائلة المستحدثة |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Cairo : |
| Name of publisher, distributor, etc. | Mohamed Hamed Ali Mohamed , |
| Date of publication, distribution, etc. | 2017 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 114 P. : |
| Other physical details | charts , facsimiles , photographs ; |
| Dimensions | 25cm |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Organic Chemistry |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Eight homologous series of 2- (or 3-) substituted phenyl 4'-(4"-alkoxy (2"-, or 3"-substituted phenylazo) benzoates (InXY) were prepared in which the suffix 2X3 refers to the lateral substituent X attached to the terminal benzene ring that carries the alkoxy group, and the suffix 2Y3 refers to the substituent attached to the other terminal phenyl group. Within each homologous series, the length of the terminal alkoxy group varies between 8, 10, 12, and 16 carbons, while the lateral polar substituents, X and Y, alternatively varies between CH3 and F. Compounds prepared were characterized by infrared, 1H-NMR spectroscopy, mass spectroscopy and elemental analyses, and their mesophase behavior investigated by differential scanning calorimetry (DSC) and identified by polarized light microscopy (PLM). The results were discussed in terms of polarity and steric effects of the two lateral groups. Transition temperatures were first correlated with the alkoxy-chain length (n) within each homologous series. Comparative correlations were made to investigate the effect of the second lateral substituent on the mesophase behavior of the previously investigated mono- laterally substituted analogues. Studies were extended to compare the phase stability of each pair of compounds that maintain one of the substituents (X or Y) constant while the other changes.UV-vis spectroscopic study revealed that the compounds I8XY exhibited two absorption bands: low intense bands at 254-263 and a broad band at 364{u2013}376. These bands are attributed to the s{u2013}s{u2217} transition of the phenyl rings and the whole mesogenic portion |
| 530 ## - ADDITIONAL PHYSICAL FORM AVAILABLE NOTE | |
| Additional physical form available note | Issued also as CD |
| 653 #4 - INDEX TERM--UNCONTROLLED | |
| Uncontrolled term | Azo/ester compounds |
| 653 #4 - INDEX TERM--UNCONTROLLED | |
| Uncontrolled term | Di-lateral substitution |
| 653 #4 - INDEX TERM--UNCONTROLLED | |
| Uncontrolled term | Phenylazo benzoate |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Abdelgwad Ali Fahmi , |
| Relator term | |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Magdi Mikhail Naoum , |
| Relator term | |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://172.23.153.220/th.pdf">http://172.23.153.220/th.pdf</a> |
| 905 ## - LOCAL DATA ELEMENT E, LDE (RLIN) | |
| Cataloger | Enas |
| Reviser | Cataloger |
| 905 ## - LOCAL DATA ELEMENT E, LDE (RLIN) | |
| Cataloger | Nazla |
| Reviser | Revisor |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Dewey Decimal Classification |
| Koha item type | Thesis |
| Source of classification or shelving scheme | Not for loan | Home library | Current library | Date acquired | Full call number | Barcode | Date last seen | Koha item type | Copy number |
|---|---|---|---|---|---|---|---|---|---|
| Dewey Decimal Classification | المكتبة المركزبة الجديدة - جامعة القاهرة | قاعة الرسائل الجامعية - الدور الاول | 11.02.2024 | Cai01.12.10.M.Sc.2017.Mo.E | 01010110074356000 | 22.09.2023 | Thesis | ||
| Dewey Decimal Classification | المكتبة المركزبة الجديدة - جامعة القاهرة | مخـــزن الرســائل الجـــامعية - البدروم | 11.02.2024 | Cai01.12.10.M.Sc.2017.Mo.E | 01020110074356000 | 22.09.2023 | CD - Rom | 74356.CD |