Results 31 to 40 of about 300,019 (196)

Ferrocene-Containing Pseudorotaxanes in Crystals: Aromatic Interactions with Hammett Correlation

Molecules, 2022
Single crystals of pseudorotaxanes, [(FcCH2NH2CH2Ar)(DB24C8)][PF6] (DB24C8 = dibenzo[24]crown-8, Fc = Fe(C5H4)(C5H5), Ar = -C6H3-3,4-Cl2, -C6H3-3,4-F2, -C6H4-4-F, -C6H4-4-Cl, -C6H4-4-Br, -C6H3-3-F-4-Me, -C6H4-4-I) and [(FcCH2NH2CH2C6H4-4-Me)(DB24C8)][Ni ...
Yuji Suzaki, Tomoko Abe, Asami Takei, Yugo Fukuchi, Take-aki Koizumi, Kohtaro Osakada, Masaki Horie   +6 more
doaj   +1 more source

تعیین ثوابت تأین بعض قواعد شف المشتقة من الفانلین والأنلین ومعوضاته بالطریقة التسحیحیة الطیفیة (تطبیق علاقة هامت) [PDF]

مجلة ابحاث كلية التربية الاساسية, 2023
شتمل البحث على تحضیر تسع مرکبات من قواعد شف من تفاعل التکاثف لالدیهاید الفانلین مع معوضات الانلین، إن ثوابت التأین لـ 3-میثوکسی-4-هیدروکسی بنزالدینیلین ومعوضاته بمجموعة النایترو بموقع اورثو ومیتا ومجموعتی المثیل والکلور فی موقع اورثو ومیتا وبارا تم ...
رواء داؤد
doaj   +1 more source

QUANTITATIVE FLUORESCENCE INTENSITYSTRUCTURE RELATIONSHIPS OF CERTAIN QUINOLONE-METAL CHELATES [PDF]

Bulletin of Pharmaceutical Sciences. Assiut University, 2006
A quantitative relationship was found between the relative fluorescence intensities of certain metal chelates of some quinolone antibacterials and their physicochemical parameters namely: the pKa1 (corresponding to the ionisation of the 3-carboxylic ...
Mohamed Abou-Elwafa, Samia El-Gizawi, Gamal Saleh, Michael El-Kommos   +3 more
doaj   +1 more source

Determination of Hammett Pyridine 3-Aza and 4-Aza Replacement Constants by 1H NMR Studies of Amide Systems [PDF]

, 1993
Values for Hammett pyridine 3-aza and 4-aza replacement constants were obtained by correlation of the amide proton chemical shifts (in DMSO) of some N-(3-pyridyl)-and N-(4-pyridyl)-dichloronicotinamides, benzamides and acetamides with those of their N ...
Setliff, Frank L., Soman, Nikhil G., Toland, Alan D.   +2 more
core   +3 more sources

Theoretical Calculation of Hammett Constants for Benzoic Acid and Its Derivatives Using AM1-DFT Method

Tikrit Journal of Pure Science
The Hammett equation constants were calculated theoretically by statistically correlating the practical Hammett equation constants for these compounds with several theoretically calculated structural properties.
Abdullah Ramadan Ali, Faiz M. Hamid
doaj   +1 more source

Synthesis, Acidity Constants and Tautomeric Structure of the Diazonium Coupling Products of 2-(Benzylsulfanyl)-7H-purin-6-one in Its Ground and Excited States

Molecules, 2011
A series of new 8-arylhydrazono-2-(benzylsulfanyl)-7H-purin-6-ones 6 were synthesized, their electronic absorption spectra in different organic solvents of varying polarities were investigated and their acid dissociation constants in both the ground and ...
Hosam A. Saad, Farag M. Altalbawy, Elham S. Darwish, Mosselhi A. Mosselhi   +3 more
doaj   +1 more source

Substituent effect on IR, 1H and 13C NMR spectral data in n-(substituted phenyl)-2-cyanoacetamides: A correlation study [PDF]

Chemical Industry and Chemical Engineering Quarterly, 2013
Linear free energy relationships (LFER) were applied to the IR, 1H and 13C NMR spectral data of N-(substituted phenyl)-2-cyanoacetamides. A variety of substituents were employed for phenyl substitution and fairly good correlations were obtained using ...
Marinković Aleksandar D., Brkić Dominik, Martinović Jelena S., Mijin Dušan Ž., Milčić Miloš, Petrović Slobodan D.   +5 more
doaj   +1 more source

The kinetics of the reaction of 6-substituted nicotinic acids and some p-substituted benzoic acids with diazodiphenylmethane in various alcohols [PDF]

Journal of the Serbian Chemical Society, 2000
Rate constants have been determined for the reactions of diazodiphenylmethane with a number of 6-substituted nicotinic acids and p-substituted benzoic acids in twelve alcohols. A comparative study was used to evaluate and compare the Hammett r values and
MILICA M. MISIC-VUKOVIC, BRATISLAV Z. JOVANOVIC, SASA Z. DRMANIC   +2 more
doaj   +2 more sources

Solvent free synthesis, spectral correlation and antimicrobial activities of some 2E 4′-nitrochalcones

Journal of Saudi Chemical Society, 2016
A series containing twelve substituted styryl 4′-nitrophenyl ketones have been synthesized using solvent free SiO2–H2SO4 catalysed aldol reaction under microwave condition. The yield of chalcones is found to be more than 80%.
Renganathan Arulkumaran, Rajasekaran Sundararajan, Sambandamoorthy Vijayakumar, S. Palanivel Sakthinathan, Ramamoorthy Suresh, Dakshnamoorthy Kamalakkannan, Kaliyaperumal Ranganathan, Ganesan Vanangamudi, Ganesamoorthy Thirunarayanan   +8 more
doaj   +1 more source

Synthesis, Electrochemistry and Density Functional Theory of Osmium(II) Containing Different 2,2′:6′,2″-Terpyridines

Molecules
In coordination chemistry, 2,2′:6′,2″-terpyridine is a versatile and extensively studied tridentate ligand. Terpyridine forms stable complexes with a variety of metal ions through coordination sites provided by the three nitrogen atoms in its pyridine ...
Nandisiwe G. S. Mateyise, Marrigje M. Conradie, Jeanet Conradie   +2 more
doaj   +1 more source