نتایج جستجو برای: type schiff base extractants

تعداد نتایج: 1572069  

Journal: :The Journal of biological chemistry 2003
Ilka Haase Markus Fischer Adelbert Bacher Nicholas Schramek

6,7-dimethyl-8-ribityllumazine synthase (lumazine synthase) catalyzes the condensation of 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione and 3,4-dihydroxy-2-butanone 4-phosphate. Presteady state kinetic experiments using the enzyme from the hyperthermophilic bacterium Aquifex aeolicus were monitored by multiwavelength photometry. An early optical transient absorbing around 330 nm is interpre...

2013
Tahseen A Alsalim Jabbar S Hadi Omar N Ali Hanna S Abbo Salam JJ Titinchi

BACKGROUND The oxidative transformation of benzoin to benzil has been accomplished by the use of a wide variety of reagents or catalysts and different reaction procedures. The conventional oxidizing agents yielded mainly benzaldehyde or/and benzoic acid and only a trace amount of benzil. The limits of practical utilization of these reagents involves the use of stoichiometric amounts of corrosiv...

2014
Nagesh Gunvanthrao Yernale Mruthyunjayaswamy Bennikallu Hire Mathada

A novel Schiff base ligand N-(4-phenylthiazol-2yl)-2-((2-thiaxo-1,2-dihydroquinolin-3-yl)methylene)hydrazinecarboxamide (L) obtained by the condensation of N-(4-phenylthiazol-2-yl)hydrazinecarboxamide with 2-thioxo-1,2-dihydroquinoline-3-carbaldehyde and its newly synthesized Cu(II), Co(II), Ni(II), and Zn(II) complexes have been characterized by elemental analysis and various spectral studies ...

2010
Md. Abdus Salam Md. Abu Affan Fasihuddin B. Ahmad M. Ibrahim Mohamed Tahir Edward R. T. Tiekink

The Sn(IV) atom in the title compound, [Sn(C(6)H(5))(C(14)H(19)N(4)S)Cl(2)], exists within a distorted octa-hedral geometry defined by the N,N',S-tridentate monodeprotonated Schiff base ligand, two mutually trans Cl atoms, and the ipso-C atom of the Sn-bound phenyl group; the latter is trans to the azo-N atom. The greatest distortion from the ideal geometry is found in the nominally trans angle...

Journal: :The Analyst 2013
Chang-Hung Chen De-Jhong Liao Chin-Feng Wan An-Tai Wu

A simple Schiff-base receptor 2 was prepared. It exhibits an “off-on-type” mode with high sensitivity in the presence of Al3+. The receptor 2 exhibited a high association constant with submicromolar detection for Al3+ in EtOH–H2O (95:5 v/v) solution. The addition of EDTA quenches the fluorescence of the receptor 2·Al3+ complex offering receptor 2 as a reversible chemosensor.

Journal: :Chemical communications 2007
Stamatia Katsiaouni Sebastian Dechert Christian Brückner Franc Meyer

This contribution describes the synthesis of a novel pyrazole-pyrrole building block and its use in the formation of a non-aromatic, Schiff base-type macrocycle incorporating a chromophore and H-bonding donor and acceptor functionalities inside and outside of the macrocycle, which makes it predestined for molecular recognition systems.

2012
K. Siddappa Chandrakant Reddy

The Complexes of the type ML2 and M′L [where M= Cu(II), Co(II), Ni(II) and Mn(II); M′= Zn(II), Cd(II) and Hg(II)] with the Schiff base ligand (HMeOQMAMQ) L=3-[(2-hydroxy-6-methoxyquinolin-3-ylmethylene)amino]-2-methyl-3H-quinazoline-4-one, have been synthesized. Their characterizations have been done by elemental analysis, conductance data, magnetic susceptibility measurements, H NMR, electroni...

2014
R. B. Sumathi M. B. Halli

A new Schiff base and a new series of Co(II), Ni(II), Cu(II), Cd(II), and Hg(II) complexes were synthesized by the condensation of naphthofuran-2-carbohydrazide and diacetylmonoxime. Metal complexes of the Schiff base were prepared from their chloride salts of Co(II), Ni(II), Cu(II), Cd(II), and Hg(II) in ethanol. The ligand along with its metal complexes have been characterized on the basis of...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان همدان - دانشکده علوم 1393

چکیده موضوع تحقیق : سنتز و شناسایی هشت لیگاند بازشیف بزرگ حلقه و بزرگ غیر حلقه ای حاوی اتمهای دهنده ی مختلف و احیای تعدادی از آنها هدف : هدف از این پرو‍‍‍ژه سنتز و شناسایی هشت لیگاند بازشیف بزرگ حلقه و بزرگ غیر حلقه ای و احیای تعدادی از آنها می باشد . روش انجام کار : در این پروژه ابتدا دو لیگاند 4 دندانه o (hl1, hl2) n3 جدید سنتز و به وسیله روشهای اسپکتروسکوپی ir و 13c nmr و 1h nmr و میکر...

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