Chemistry & Earth Sciences: Recent submissions
Now showing items 501-520 of 587
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Synthesis, characterization and spectroscopic structural studies of charge-transfer complexes of 1,4,8,11-tetraazacyclotetradecane-5,7-dione with iodine, TCNE and DDQ
( Elsevier B.V. , 2010 , Article)Three novel aqueous and solid charge-transfer complexes are synthesized by the reaction of the polynitrogen cyclic n-donor 1,4,8,11-tetraazacyclotetradecane-5,7-dione (TACTDD) with the σ-acceptor iodine, the aliphatic ... -
Synthesis, spectroscopic and thermal studies of the reactions of the donors piperazine and N,N′-dimethylpiperazine with σ- and π-acceptors
( Elsevier , 2008 , Article)Abstract The interactions of the electron donors piperazine (PIP) and N,N′-dimethylpiperazine (DMPIP) with the σ-acceptor iodine and the π-acceptors tetracyanoethylene (TCNE) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone ... -
Photocatalytic degradation of methyl orange as a model compound
( Elsevier , 2002 , Article)Titanium dioxide (TiO2) was used as a photocatalyst for the detoxification of water containing methyl orange (MO), which was used as a model compound. Solar radiation was used as an irradiation source. It was found that ... -
Rapid microwave assisted sol-gel synthesis of CeO2 and CexSm1-xO2 nanoparticle catalysts for CO oxidation
( Elsevier , 2016 , Article)CeO2 and CexSm1-xO2 nanoparticle mixed oxides have been synthesized by microwave assisted sol-gel (MW sol-gel) and conventional sol-gel synthesis carried out at 60°C (typical sol-gel) and 100°C (approaching the MW temperature). ... -
Synthesis, spectroscopic and thermal studies of charge-transfer molecular complexes formed in the reaction of 1,4-bis (3-aminopropyl) piperazine with σ- and π acceptors
( Elsevier , 2012 , Article)Abstract In the present study, solid charge-transfer (CT) molecular complexes formed in the reaction of the electron donor 1,4-bis (3-aminopropyl) piperazine (APPIP) with the σ-electron acceptor iodine and π-acceptors ... -
Charge-transfer complexes formed in the reaction of 1,4,7,10-tetraazacyclododecane with π-electron acceptors
( Elsevier , 2013 , Article)Abstract The reactions of the electron donor 1,4,7,10-tetraazacyclododecane (TACDD) with the π-electron acceptors 7,7,8,8-tetracyanoquinodimethane (TCNQ), tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone ... -
Charge-transfer complexes formed in the reaction of 2-amino-4-ethylpyridine with π-electron acceptors
( Elsevier , 2016 , Article)Molecular charge-transfer complexes (CT) of electron donor 2-amino-4-ethylpyridine (2A4EPy) with π-acceptors tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and 2,4,4,6-tetrabromo-2,5-cyclohexadienone ... -
Spectroscopic investigation of the novel charge-transfer complex [(phen)(TCNE)12] formed in the reaction of phenacetin with tetracyanoethylene
( Elsevier , 2005 , Article)The charge-transfer (CT) interaction of the electron donor phenacetin (phen) and the π-electron acceptor tetracyanoethylene (TCNE) has been studied in CH2Cl2. The results obtained indicate the formation of the novel ... -
Synthesis and spectroscopic structural investigations of the charge-transfer complexes formed in the reaction of 2,6-diaminopyridine with π-acceptors TCNE, chloranil, and DDQ
( Elsevier , 2007 , Article)Molecular charge-transfer complexes of the donor 2,6-diaminopyridine (2,6-DAPY) with π-acceptors tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and tetrachloro-p-benzoquinone(chloranil) were studied ... -
Spectrophotometric and thermal studies on the charge – Transfer complexes of 4-(aminomethyl) piperidine as donor with σ- and π-electron acceptors
( Elsevier , 2014 , Article)The spectroscopic characteristics of the solid charge-transfer molecular complexes (CT) formed in the reaction of the electron donor 4-(aminomethyl) piperidine (4AMP) with the σ-acceptor iodine and the π-acceptors ... -
Synthesis and spectroscopic structural studies of the adducts formed in the reaction of aminopyridines with TCNQ
( Elsevier , 2006 , Article)The adducts 7,7-dicyano-8,8-di-m-aminopyridilequinodimethane and 7,7-dicyano-8,8-di-p-aminopyridilequinodimethane are formed by the reaction of the electron donors 3-aminopyridine (3APY) and 4-aminopyridine (4APY), ... -
Spectroscopic investigation of the charge-transfer interactions between 1,4,7-trimethyl-1,4,7-triazacyclononane and the acceptors iodine, TCNE, TCNQ and chloranil
( Elsevier , 2007 , Article)The interaction of the interesting polynitrogen cyclic base 1,4,7-trimethyl-1,4,7-triazacyclononane (TMTACN) with the σ-acceptor iodine and π-acceptors tetracyanoethylene (TCNE), 7,7,8,8-tetracyanoquinodimethane (TCNQ) and ... -
Relationship of plant proteins and amino acids within taxonomic categories in Qatari range plants
( Asian Publication Corporation , 2005 , Article)Protein and amino acids of sixty-eight range plants growing wild in Qatar belonging to fifty-six genera and twenty-three families are studied to evaluate their nutritive values -
Fatty acids composition of Fifty-one plant species growing in Qatar
(2004 , Article)Fatty acids and lipids composition of fifty one species growing in Qatar belonging to twenty one families and forty three genera are reported -
Constituents of Plants Growing in Qatar XXXIII Proximate composition of thirty four food and feed plants growing in Qatar
(2003 , Article)34 wild species within 32 genera belonging to 14 families from the flora of Qatar were analyzed for their moisture, lipids, carbohydrate, protein, crude fiber and ash content -
Constituents of Plants Growing in Qatar, Part XXXI: Lipid constituents of seventeen range plants growing in Qatar
(2002 , Article)A preliminary study on the nutritive values of 17 Qatari range plants -
Novel charge transfer complexes of the donor 1,4,7,10,13,16-hexamethyl-1,4,7,10,13,16-hexaazacyclooctadecane and the acceptors iodine, TCNE, and TCNQ
( Elsevier , 2011 , Article)Abstract Novel charge transfer complexes have been formed in the reaction of the interesting powerful electron donor 1,4,7,10,13,16-hexamethyl-1,4,7,10,13,16-hexaazacyclooctadecane (HMHACOD) with σ-electron acceptor iodine ... -
Chemical survey of some plants Growing in Qatar
(1989 , Article)Fifty one plants growing in Qatar, belonging to thirty families, were surveyed for alkaloids, anthraquinones, coumarins, flavonoids, tannins and saponins. The medicinal uses of these plants arereported. -
Constituents of Plants Growing in Qatar, Part XXX: A New Iridoid from Cistanche Phelypaea (L) COUT
(1995 , Article)New iridoid named phelypaeside (1) was isolated from the dried aerial parts of Cistanche phelypae (Orobanchaceae) growing in Qatar -
Constituents of Plants Growing in Qatar, Part XXVI: Phytochemical investigation of Rumex vesicarius
(1995 , Article)The study of Rumex vesicarius revealed the isolation and identification of four anthraquinones (chrysoplanol (I), emodin (II), physcion (III) and rhein (IV) and seven flavonoids (apigenin (V), isoorientin (VI), isovitesin ...
