نتایج جستجو برای: phosphonates

تعداد نتایج: 1275  

2016
Yudong Cui Xin Lin Huan Zhang Lingxiao Lin Senjie Lin

Phosphorus (P) is an essential nutrient for marine phytoplankton but its preferred form, dissolved inorganic phosphorus (DIP), is often limited in the euphotic zone of the ocean. Many phytoplankton species have developed the ability to utilize dissolved organic phosphorus (DOP) such as phosphoesters or phosphonates. Phosphonates are characterized by the stable C-P bond and its utilization is kn...

Journal: :Inorganic chemistry 2015
Pravas Deria Wojciech Bury Idan Hod Chung-Wei Kung Olga Karagiaridi Joseph T Hupp Omar K Farha

Solvent-assisted ligand incorporation (SALI) is useful for functionalizing the channels of metal-organic framework (MOF) materials such as NU-1000 that offer substitutionally labile zirconium(IV) coordination sites for nonbridging ligands. Each of the 30 or so previous examples relied upon coordination of a carboxylate ligand to achieve incorporation. Here we show that, with appropriate attenti...

2010
Sumit Khanra Rachel Shaw Madeleine Helliwell Floriana Tuna Christopher A. Muryn Eric J. L. McInnes Richard E. P. Winpenny

The synthesis and structural characterization of two families of low-valent vanadium(III) {V6P4} and vanadium(III/IV) {V13P8} phosphonate complexes are reported. Magnetic characterization is reported for representative examples.

Journal: :Organic & biomolecular chemistry 2012
Pandi Muthupandi Govindasamy Sekar

An unusual dinuclear chiral iron complex has been synthesized and effectively utilized in the asymmetric hydrophosphorylation of aldehydes to synthesize optically active α-hydroxy phosphonates with excellent yield and good enantioselectivity.

Journal: :Dalton transactions 2013
Vadapalli Chandrasekhar Dipankar Sahoo Ramakirushnan Suriya Narayanan Raymond J Butcher Franscesc Lloret Emilio Pardo

Structure and characterization of [Cu26{2,3,5,6-(Me)4C6H-CH2-PO3}18(μ2-OH)4(μ3-OH)6(μ4-Cl)6(μ-OH2)2(OH2)2(MeCN)4]·6MeCN·15H2O (1) is reported. Complex 1 is the largest discrete molecular homometallic transition metal phosphonate assembly. Remarkably, this gigantic molecular phosphonate has been prepared at room temperature using a normal solution synthetic method.

Journal: :Chemistry 2005
Marcin Sawicki Jean-Michel Siaugue Christophe Jacopin Christophe Moulin Théodorine Bailly Ramon Burgada Stéphane Meunier Paul Baret Jean-Louis Pierre Frédéric Taran

New tripodal gem-(bis-phosphonates) uranophiles were discovered by a screening method that allowed for the selection of ligands with strong uranyl-binding properties in a convenient microtiter-plate format. The method is based on competitive uranium binding by using Sulfochlorophenol S as chromogenic chelate. This dye compound was found to present high uranyl complexation properties and allowed...

Journal: :Biochemistry 2002
Celia C H Chen H Zhang A D Kim A Howard G M Sheldrick D Mariano-Dunaway O Herzberg

Phosphonates allow certain organisms to thrive in otherwise hostile environments, and 2-aminoethylphosphonate (AEP) is a precursor of many cellular phosphonates. AEP transaminase (AEPT) is an enzyme essential to phosphonate synthesis and degradation pathways. The crystal structure of AEP transaminase was determined by multiwavelength anomalous diffraction of 66 selenium atoms. The refined struc...

Journal: :Journal of medicinal chemistry 2005
Yung-hyo Koh Jae Hoon Shim Jim Zhen Wu Weidong Zhong Zhi Hong Jean-Luc Girardet

A series of adenosine 5'-phosphonate analogues were designed to mimic naturally occurring adenosine monophosphate. These compounds (1-5) were synthesized and evaluated in a cellular hepatitis C virus (HCV) replication assay. To improve cellular permeability and enhance the anti-HCV activity of these phosphonates, a bis(S-acyl-2-thioethyl) prodrug for compound 5 was prepared, and its cellular ac...

Journal: :Dalton transactions 2016
Uppara Ugandhar Viswanathan Baskar

Molecular oxo-hydroxo clusters have been synthesized by reactions of arylstibonic acids with organophosphonic acid and phenylseleninic acid. Single crystal X-ray structural elucidation revealed the formation of [(p-i-PrC6H4Sb)4(OH)4(t-BuPO3)6] (1), [(p-t-BuC6H4Sb)4(O)2(PhPO3)4(PhPO3H)4] (2), [(p-i-PrC6H4Sb)4(O)3(OH)(PhSeO2)2(t-BuPO3)4(t-BuPO3H2)2] (3), [(p-MeC6H4Sb)4(O)3(OH)(PhSeO2)2(t-BuPO3)4(...

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