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Wang L, Su X, Xie JH, Ming LJ. Specific recognitions of multivalent cyclotriphosphazene derivatives in sensing, imaging, theranostics, and biomimetic catalysis. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214326] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Jeevananthan V, Thangavelu SAG, Loganathan P, Shanmugan S. Multisite Coordination Ligands on Cyclotriphosphazene Core for the Assembly of Metal Clusters and Porous Coordination Polymers. ChemistrySelect 2021. [DOI: 10.1002/slct.202004431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Velusamy Jeevananthan
- Department of Chemistry Faculty of Engineering and Technology SRM Institute of Science and Technology Kattankulathur, Kancheepuram 603203 Tamil Nadu India
| | - Senthil A. Gurusamy Thangavelu
- Department of Chemistry Faculty of Engineering and Technology SRM Institute of Science and Technology Kattankulathur, Kancheepuram 603203 Tamil Nadu India
| | - Pushparaj Loganathan
- Department of Chemistry Faculty of Engineering and Technology SRM Institute of Science and Technology Kattankulathur, Kancheepuram 603203 Tamil Nadu India
| | - Swaminathan Shanmugan
- Department of Chemistry Faculty of Engineering and Technology SRM Institute of Science and Technology Kattankulathur, Kancheepuram 603203 Tamil Nadu India
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Silva MDGDOE, Galuppo C, Tudisco BC, Oliveira Junior AGD, Barrionuevo MV, Abbehausen C, Buffon R. Synthesis and characterization of a palladium(0) complex with cyclophosphazene bearing two diphenylphosphine ligands and application in Suzuki-Miyaura cross-coupling. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.05.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Beşli S, Mutlu Balcı C, Doğan S, Allen CW. Regiochemical Control in the Substitution Reactions of Cyclotriphosphazene Derivatives with Secondary Amines. Inorg Chem 2018; 57:12066-12077. [DOI: 10.1021/acs.inorgchem.8b01620] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Serap Beşli
- Department of Chemistry, Gebze Technical University, 41400 Gebze Kocaeli, Turkey
| | - Ceylan Mutlu Balcı
- Department of Chemistry, Gebze Technical University, 41400 Gebze Kocaeli, Turkey
| | - Semih Doğan
- Department of Chemistry, Gebze Technical University, 41400 Gebze Kocaeli, Turkey
| | - Christopher W. Allen
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405-0125, United States
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Davarcı D, Gür R, Beşli S, Şenkuytu E, Zorlu Y. Silver(I) coordination polymers assembled from flexible cyclotriphosphazene ligand: structures, topologies and investigation of the counteranion effects. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS 2016; 72:344-56. [DOI: 10.1107/s2052520616002663] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 02/15/2016] [Indexed: 11/10/2022]
Abstract
The reactions of a flexible ligand hexakis(3-pyridyloxy)cyclotriphosphazene (HPCP) with a variety of silver(I) salts (AgX;X= NO3−, PF6−, ClO4−, CH3PhSO3−, BF4−and CF3SO3−) afforded six silver(I) coordination polymers, namely {[Ag2(HPCP)]·(NO3)2·H2O}n(1), {[Ag2(HPCP)(CH3CN)]·(PF6)2}n(2), {[Ag2(HPCP)(CH3CN)]·(ClO4)2}n(3), [Ag3(HPCP)(CH3PhSO3)3]n(4), [Ag2(HPCP)(CH3CN)(BF4)2]n(5) and {[Ag(HPCP)]·(CF3SO3)}n(6). All of the isolated crystalline compounds were structurally determined by X-ray crystallography. Changing the counteranions in the reactions, which were conducted under similar conditions ofM/Lratio (1:1), temperature and solvent, resulted in structures with different types of topologies. In complexes (1)–(6), the ligand HPCP shows different coordination modes with AgIions giving two-dimensional layered structures and three-dimensional frameworks with different topologies. Complex (1) displays a new three-dimensional framework adopting a (3,3,6)-connected 3-nodal net with point symbol {4.62}2{42.610.83}. Complexes (2) and (3) are isomorphous and have a two-dimensional layered structure showing the same 3,6L60 topology with point symbol {4.26}2{48.66.8}. Complex (4) is a two-dimensional structure incorporating short Ag...Ag argentophilic interactions and has a uninodal 4-connectedsql/Shubnikov tetragonal plane net with {44.62} topology. Complex (5) exhibits a novel three-dimensional framework and more suprisingly contains twofold interpenetrated honeycomb-like networks, in which the single net has a trinodal (2,3,5)-connected 3-nodal net with point symbol {63.86.12}{63}{8}. Complex (6) crystallizes in a trigonal crystal system with the space group R\bar 3 and possesses a three-dimensional polymeric structure showing a binodal (4,6)-connectedfshnet with the point symbol (43.63)2.(46.66.83). The effect of the counteranions on the formation of coordination polymers is discussed in this study.
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Biocatalysis by metallated cyclotriphosphazenes: L2Zn(NO3)2 {L = spiro-N3P3[O2C12H8][N(CH3)NH2]} as a synthetic phosphoesterase and nuclease. J CHEM SCI 2016. [DOI: 10.1007/bf03356113] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Asmafiliz N, Kılıç Z, Civan M, Avcı O, Yasemin Gönder (née Koç) L, Açık L, Aydın B, Türk M, Hökelek T. Phosphorus–nitrogen compounds. Part 36. Syntheses, Langmuir–Blodgett thin films and biological activities of spiro-bino-spiro trimeric phosphazenes. NEW J CHEM 2016. [DOI: 10.1039/c6nj02052f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses, spectroscopic and crystallographic properties, LB films, antimicrobial and cytotoxic activities of spiro-bino-spiro phosphazenes were investigated.
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Affiliation(s)
| | - Zeynel Kılıç
- Department of Chemistry
- Ankara University
- 06100 Ankara
- Turkey
| | - Mehmet Civan
- Department of Physics
- Hacettepe University
- 06800 Ankara
- Turkey
| | - Orhan Avcı
- Department of Biology
- Gazi University
- 06500 Ankara
- Turkey
| | | | - Leyla Açık
- Department of Biology
- Gazi University
- 06500 Ankara
- Turkey
| | - Betül Aydın
- Department of Biology
- Gazi University
- 06500 Ankara
- Turkey
| | - Mustafa Türk
- The Turkish Sugar Authority
- 06510 Çankaya-Ankara
- Turkey
- Department of Bioengineering
- Kırıkkale University
| | - Tuncer Hökelek
- Department of Physics
- Hacettepe University
- 06800 Ankara
- Turkey
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Çıralı DE, Dayan O. Synthesis of Tetranuclear Ruthenium (Ii) Complex of Pyridyloxy-Substituted 2,2′-Dioxybiphenyl-Cyclotriphosphazene Platform and its Catalytic Application in the Transfer Hydrogenation of Ketones. PHOSPHORUS SULFUR 2015. [DOI: 10.1080/10426507.2014.966190] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Diğdem Erdener Çıralı
- Department of Chemistry, Faculty of Science and Arts, Çanakkale Onsekiz Mart University, TR 17100, Çanakkale, Turkey
| | - Osman Dayan
- Department of Chemistry, Faculty of Science and Arts, Çanakkale Onsekiz Mart University, TR 17100, Çanakkale, Turkey
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9
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Ning Y, Gao M, Zheng K, Zhang Z, Zhou J, Hao X, Cao R. Phosphate monoester hydrolysis at tricopper site: The advantage and disadvantage of closely assembled trimetallic active sites. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.03.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Mukundam V, Kumar A, Dhanunjayarao K, Ravi A, Peruncheralathan S, Venkatasubbaiah K. Tetraaryl pyrazole polymers: versatile synthesis, aggregation induced emission enhancement and detection of explosives. Polym Chem 2015. [DOI: 10.1039/c5py01218j] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we report a new approach to obtain tetraaryl pyrazole polymers by free radical polymerization of styryl substituted pyrazole monomers.
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Affiliation(s)
- Vanga Mukundam
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Institute of Physics Campus
- Bhubaneswar-751005
- India
| | - Atul Kumar
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Institute of Physics Campus
- Bhubaneswar-751005
- India
| | - Kunchala Dhanunjayarao
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Institute of Physics Campus
- Bhubaneswar-751005
- India
| | - Arthi Ravi
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Institute of Physics Campus
- Bhubaneswar-751005
- India
| | - S. Peruncheralathan
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Institute of Physics Campus
- Bhubaneswar-751005
- India
| | - Krishnan Venkatasubbaiah
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER) Institute of Physics Campus
- Bhubaneswar-751005
- India
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12
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Investigation of the structural properties of 2-naphthylamine substituted cyclotetraphosphazenes. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.03.062] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Orth ES, Fonsaca JES, Almeida TG, Domingues SH, Ferreira JGL, Zarbin AJG. Functionalized graphene oxide as a nanocatalyst in dephosphorylation reactions: pursuing artificial enzymes. Chem Commun (Camb) 2014; 50:9891-4. [DOI: 10.1039/c4cc03262d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first report on the use of thiol-functionalized graphene oxide as a recyclable nanocatalyst in dephosphorylation reactions with impressive activity (>105-fold).
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Affiliation(s)
- Elisa S. Orth
- Department of Chemistry
- Universidade Federal do Paraná (UFPR)
- Curitiba, Brazil
| | | | | | - Sergio H. Domingues
- Department of Chemistry
- Universidade Federal do Paraná (UFPR)
- Curitiba, Brazil
| | - José G. L. Ferreira
- Department of Chemistry
- Universidade Federal do Paraná (UFPR)
- Curitiba, Brazil
| | - Aldo J. G. Zarbin
- Department of Chemistry
- Universidade Federal do Paraná (UFPR)
- Curitiba, Brazil
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14
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Li X, Jiang F, Chen L, Wu M, Chen Q, Bu Y, Hong M. Three novel 3D coordination polymers based on a flexible multisite cyclotetraphosphazene ligand. Dalton Trans 2012; 41:14038-41. [DOI: 10.1039/c2dt31852k] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Chandrasekhar V, Krishnan V, Azhakar R, Senapati T, Dey A, Suriya Narayanan R. Carbophosphazene-Supported Ligand Systems Containing Pyrazole/Guanidine Coordinating Groups. Inorg Chem 2011; 50:2568-79. [DOI: 10.1021/ic102415x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
| | | | - Ramachandran Azhakar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Tapas Senapati
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Atanu Dey
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - R. Suriya Narayanan
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
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16
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Wang L, Ye Y, Lykourinou V, Angerhofer A, Ming LJ, Zhao Y. Metal Complexes of a Multidentate Cyclophosphazene with Imidazole-Containing Side Chains for Hydrolyses of Phosphoesters - Bimolecular vs. Intramolecular Dinuclear Pathway. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201000668] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Chandrasekhar V, Senapati T, Dey A, Hossain S. Molecular transition-metal phosphonates. Dalton Trans 2011; 40:5394-418. [DOI: 10.1039/c0dt01069c] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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18
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Tang SP, Chen S, Wu GF, Chen HY, Mao ZW, Ji LN. Ester catalytic hydrolysis by a tridentate N,N′,N″-copper bridged cyclodextrin dimer. INORG CHEM COMMUN 2011. [DOI: 10.1016/j.inoche.2010.10.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Işiklan M, Asmafiliz N, Ozalp EE, Ilter EE, Kiliç Z, Coşut B, Yeşilot S, Kiliç A, Oztürk A, Hökelek T, Bilir LYK, Açik L, Akyüz E. Phosphorus-nitrogen compounds. 21. Syntheses, structural investigations, biological activities, and DNA interactions of new N/O spirocyclic phosphazene derivatives. The NMR behaviors of chiral phosphazenes with stereogenic centers upon the addition of chiral solvating agents. Inorg Chem 2010; 49:7057-71. [PMID: 20583756 DOI: 10.1021/ic100781v] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of hexachlorocyclotriphosphazatriene, N(3)P(3)Cl(6), with N/O-donor-type N-alkyl (or aryl)-o-hydroxybenzylamines (1a-1e) produce mono- (2a-2e), di- (3a-3d), and tri- (4a and 4b) spirocyclic phosphazenes. The tetrapyrrolidino monospirocyclic phosphazenes (2f-2i) are prepared from the reactions of partly substituted compounds (2a-2d) with excess pyrrolidine. The dispirodipyrrolidinophosphazenes (3e-3h) and trispirophosphazenes (3i-3k) are obtained from the reactions of trans-dispirophosphazenes with excess pyrrolidine and sodium (3-amino-1-propanoxide), respectively. Compounds 3a-3d have cis and trans geometric isomers. Only the trans isomers of these compounds are isolated. Compounds 3a-3h have two stereogenic P atoms. They are expected to be in cis (meso) and trans (racemic) geometric isomers. In the trans trispiro compounds (3i-3k), there are three stereogenic P atoms. They are expected to be in racemic mixtures. The stereogenic properties of 3a-3k are confirmed by (31)P NMR spectroscopy upon the addition of the chiral solvating agent; (S)-(+)-2,2,2-trifluoro-1-(9'-anthryl)ethanol. The molecular structures of 3i-3k, 4a, and 4b look similar to a propeller, where the chemical environment of one P atom is different from that of others. Additionally, 4a and 4b are also expected to exist as cis-trans-trans and cis-cis-cis geometric isomers, but both of them are found to be in cis-trans-trans geometries. The solid-state structures of 2a, 2e, 2f, 3e, and 3f are determined by X-ray crystallography. The compounds 2f-2i, 3e-3i, and 3k are screened for antibacterial activity against gram-positive and gram-negative bacteria and for antifungal activity against yeast strains. These compounds (except 3f) have shown a strong affinity against most of the bacteria. Minimum inhibitory concentrations (MIC) are determined for 2f-2i, 3e-3i, and 3k. DNA binding and the nature of interaction with pUC18 plasmid DNA are studied. The compounds 2f-2i, 3e-3i, and 3k induce changes on the DNA mobility. The prevention of BamHI and HindIII digestion (except 2g) with compounds indicates that the compounds bind with nucleotides in DNA.
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Affiliation(s)
- Muhammet Işiklan
- Department of Chemistry, Kirikkale University, Kirikkale, Turkey
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20
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Okumuş A, Bilge S, Kiliç Z, Oztürk A, Hökelek T, Yilmaz F. Phosphorus-nitrogen compounds. Part 20: Fully substituted spiro-cyclotriphosphazenic lariat (PNP-pivot) ether derivatives. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 76:401-409. [PMID: 20444643 DOI: 10.1016/j.saa.2010.04.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 03/31/2010] [Accepted: 04/08/2010] [Indexed: 05/29/2023]
Abstract
The condensation reactions of partly substituted spiro-cyclotriphosphazenic lariat (PNP-pivot) ethers, N(3)P(3)[(o-NHPhO)(2)R]Cl(4) [where R=-CH(2)CH(2)- (1) and -CH(2)CH(2)OCH(2)CH(2)- (2)] with morpholine and 1,4-dioxa-8-azaspiro[4,5]decane (DASD) produce fully substituted morpholino (3 and 4) and 1,4-dioxa-8-azaspiro[4,5]deca (5 and 6) phosphazenes. These are the new examples of the spiro-cyclophosphazenic lariat ether derivatives with N(2)O(x) (x=2 and 3) donor type containing 11- and 14-membered macrocycles. The solid state structures of 3, 5 and 6 have been determined by X-ray diffraction techniques. Compound 3 has intermolecular N-H...O hydrogen bond, compound 5 has intra- and intermolecular N-H...O hydrogen bonds, while compound 6 has intramolecular N-H...O and O-H...N and intermolecular N-H...O and O-H...O hydrogen bonds. The correlations of the endocyclic (alpha) and exocyclic (alpha') NPN bond angles with deltaP(spiro) values are investigated. The structural investigations of 3-6 have been verified by elemental analyses, MS, FTIR, (1)H, (13)C and (31)P NMR, DEPT and HETCOR techniques.
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Affiliation(s)
- Aytuğ Okumuş
- Department of Chemistry, Ankara University, Tandoğan 06100, Ankara, Turkey
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21
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Chandrasekhar V, Murugesapandian B. Phosphorus-supported ligands for the assembly of multimetal architectures. Acc Chem Res 2009; 42:1047-62. [PMID: 19453168 DOI: 10.1021/ar800221e] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Modeled after boron-based scorpionate ligands, acyclic and cyclic phosphorus-containing compounds possessing reactive groups can serve as excellent precursors for the assembly of novel phosphorus-supported ligands that can coordinate multiple sites. In such ligands, the phosphorus atom does not have any role in coordination but is used as a structural support to assemble one or more coordination platforms. In this Account, we describe the utility of inorganic heterocyclic rings such as cyclophosphazenes and carbophosphazenes as well as acyclic phosphorus-containing compounds such as (S)PCl(3), RP(O)Cl(2), and R(2)P(O)Cl for building such multisite coordination platforms. We can modulate the number and orientation of such coordination platforms through the choice of the phosphorus-containing precursor. This methodology is quite general and modular and allows the creation of well-defined libraries of multisite coordination ligands. Phosphorus-supported pyrazolyl ligands are quite useful for building multimetallic architectures. Some of these ligands are prone to P-N bond hydrolysis upon metalation, but we have exploited the P-N bond sensitivity to generate hydrolyzed ligands in situ, which are useful to build multimetal assemblies. In addition, the intimate relationship between small molecule cyclophosphazenes and the corresponding pendant cyclophosphazene-containing polymer systems facilitated our design of polymer-supported catalysts for phosphate ester hydrolysis, plasmid DNA modification, and C-C bond formation reactions. Phosphorus hydrazides containing reactive amine groups are ideal precursors for integration into more complex ligand systems. The ligand (S)P[N(Me)N=CH-C(6)H(4)-2-OH](3) (LH(3)) contains six coordination sites, and its coordination response depends upon the oxidation state of the metal ion employed. LH(3) reacts with divalent transition metal ions to afford neutral trimetallic derivatives L(2)M(3), where the three metal ions are arranged in a perfectly linear manner in many cases. Incorporating an additional methoxy group into LH(3) affords the ligand (S)P[N(Me)N=CH-C(6)H(3)-2-OH-3-OMe](3) (L'H(3)), which contains nine coordination sites: three imino nitrogen atoms, three phenolate oxygen atoms, and three methoxy oxygen atoms. The reaction of L'H(3) with transition metal salts in 1:1 ratio leads to the in situ formation of a metalloligand (L'M), which on further treatment with lanthanide salts gives heterobimetallic trinuclear cationic complexes [L'(2)M(2)Ln](+) containing a M-Ln-M linear array (M = transition metal ion in a +2 oxidation state). Many of these 3d-4f compounds behave as single-molecule magnets at low temperatures. Although challenges remain in the development of synthetic methods and in the architectural control of the coordination platforms, we see opportunities for further research into coordination platforms supported by main group elements such as phosphorus. As we have shown in this Account, one potential disadvantage, sensitivity of P-N bonds to hydrolysis, can be used successfully to build larger assemblies.
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22
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Chang YC, Chen DH. Highly efficient hydrolysis of phosphodiester by a copper(II)-chelated chitosan magnetic nanocarrier. REACT FUNCT POLYM 2009. [DOI: 10.1016/j.reactfunctpolym.2009.04.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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23
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Mohamed MF, Neverov AA, Brown RS. An Immobilized Ortho-Palladated Dimethylbenzylamine Complex as an Efficient Catalyst for the Methanolysis of Phosphorothionate Pesticides. Inorg Chem 2008; 48:1183-91. [DOI: 10.1021/ic801382e] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mark F. Mohamed
- Department of Chemistry, Queen’s University, Chernoff Hall, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
| | - Alexei A. Neverov
- Department of Chemistry, Queen’s University, Chernoff Hall, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
| | - R. Stan Brown
- Department of Chemistry, Queen’s University, Chernoff Hall, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
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Martínez-Ferrero E, Franc G, Mazères S, Turrin CO, Boissière C, Caminade AM, Majoral JP, Sanchez C. Optical properties of hybrid dendritic-mesoporous titania nanocomposite films. Chemistry 2008; 14:7658-69. [PMID: 18668494 DOI: 10.1002/chem.200800606] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
New hybrid optical sensors have been prepared by grafting specifically designed fluorescent, functionalised, phosphorus-containing dendrimers onto a nanocrystalline mesoporous titania thin film formed by evaporation-induced self-assembly. The structural characterisation and optical behaviour of these new fluorescent probes have been studied both in solution and after being grafted onto an inorganic network, which resulted in the discovery of improved probing selectivity in the solid state. This new hybrid sensor exhibits high sensitivity to phenolic OH moieties (especially those from resorcinol and 2-nitroresorcinol), which induce the quenching of fluorescence more efficiently in the solid state than in solution. This effect is a result of the increased spatial proximity of the fluorescent molecules, which is induced by pore confinement that makes the formation of hydrogen bonds between the hydroxyl moieties of the quenchers and the carbonyl groups of the dendrimer easier.
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Affiliation(s)
- Eugenia Martínez-Ferrero
- Laboratoire de Chimie de la Matière Condensée, Université Pierre et Marie Curie, 4 Place Jussieu, Paris Cedex 05, France
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Rolland O, Griffe L, Poupot M, Maraval A, Ouali A, Coppel Y, Fournié JJ, Bacquet G, Turrin CO, Caminade AM, Majoral JP, Poupot R. Tailored Control and Optimisation of the Number of Phosphonic Acid Termini on Phosphorus-Containing Dendrimers for the Ex-Vivo Activation of Human Monocytes. Chemistry 2008; 14:4836-50. [DOI: 10.1002/chem.200701063] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Chandrasekhar V, Thilagar P, Murugesa Pandian B. Cyclophosphazene-based multi-site coordination ligands. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2006.07.005] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chandrasekhar V, Pandian BM, Azhakar R. Di- and Trinuclear Complexes Derived from Hexakis(2-pyridyloxy)cyclotriphosphazene. Unusual P−O Bond Cleavage in the Formation of [{(L‘CuCl)2(Co(NO3)}Cl] (L‘ = N3P3(OC5H4N)5(O)). Inorg Chem 2006; 45:3510-8. [PMID: 16634581 DOI: 10.1021/ic0517467] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hexakis(2-pyridyloxy)cyclotriphosphazene (L) is an efficient multisite coordination ligand which binds with transition metal ions to produce dinuclear (homo- and heterometallic) complexes [L(CuCl)(CoCl3)], [L(CuCl)(ZnCl3)], [L(CoCl)(ZnCl3)], and [L(ZnCl2)2]. In these dinuclear derivatives the cyclophosphazene ligand utilizes from five to six nitrogen coordination sites out of the maximum of nine available sites. Further, the spacer oxygen that separates the pyridyl moiety from the cyclophosphazene ring ensures minimum steric strain to the cyclophosphazene ring upon coordination. This is reflected in the near planarity of the cyclophosphazene ring in all the dinuclear derivatives. In the dinuclear heterobimetallic derivatives one of the metal ions [Cu(II) or Co(II)] is hexacoordinate and is bound by the cyclophosphazene in a eta5-gem-N5 mode. The other metal ion in these heterobimetallic derivatives [Co(II) or Zn(II)] is tetracoordinate and is bound in an eta(1)-N(1) fashion. In the homobimetallic derivative, [L(ZnCl2)2], one of the zinc ions is five-coordinate (eta3-nongem-N3), while the other zinc ion is tetracoordinate(eta2-gem-N2). The reaction of L with CuCl2 followed by Co(NO3)2.6H2O yields a trinuclear heterobimetallic complex [{(L'CuCl)2Co(NO3)}Cl] [L' = N3P3(OC5H4N)5(O)]. In the formation of this compound an unusual P-O bond cleavage involving one of the phosphorus-pyridyloxy bonds is observed. The molecular structure of [{(L'CuCl)2Co(NO3)}Cl] [L' = N3P3(OC5H4N)5(O)] reveals that each of the two the P-O-cleaved L' ligands is involved in binding to Cu(II) to generate the motif L'CuCl. Two such units are bridged by a Co(II) ion. The coordination environment around the bridging Co(II) ion contains four oxygen (two P-O units, one chelating nitrate) and two nitrogen atoms (pyridyloxy nitrogens).
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Schiller A, Scopelliti R, Severin K. Enhanced hydrolytic activity of Cu(ii) and Zn(ii) complexes in highly cross-linked polymers. Dalton Trans 2006:3858-67. [PMID: 16896445 DOI: 10.1039/b605676h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chelate ligand tris[(1-vinylimidazol-2-yl)methyl]amine (5) was synthesized in five steps from commercially available starting materials. Upon reaction with ZnCl2 or CuCl2 in the presence of NH4PF6, the complexes [Zn5Cl]PF6 (6) and [Cu5Cl]PF6 (7) were obtained. The structure of both complexes was determined by single-crystal X-ray crystallography. Immobilization of 6 and 7 was achieved by co-polymerization with ethylene glycol dimethacrylate. The supported complexes P6-Zn and P7-Cu were found to be efficient catalysts for the hydrolysis of bis(p-nitrophenyl)phosphate (BNPP) at 50 degrees C. At pH 9.5, the heterogeneous catalyst P7-Cu was 56 times more active than the homogeneous catalyst 7. Partitioning effects, which increase the local concentration of BNPP in the polymer, are shown to contribute to the enhanced activity of the immobilized catalyst.
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Affiliation(s)
- Alexander Schiller
- Institut des Sciences et Ingénieries Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
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Özgüç B, Bilge S, Çaylak N, Demiriz Ş, İşler H, Hayvalı M, Kılıç Z, Hökelek T. Phosphorus–nitrogen compounds: novel spiro-cyclophosphazenic lariat (PNP-pivot) ether derivatives. Structures of 4,4,6,6-tetrachloro-2,2-[3-oxa-1,5-pentane dioxy bis(2-phenylamino)]cyclo-2λ5,4λ5,6λ5-triphosphazene and 4,4,6,6-tetrachloro-2,2-[1,2-xylylene dioxy bis(2-phenylamino)]cyclo-2λ5,4λ5,6λ5-triphosphazene. Part X. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2005.02.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chandrasekhar V, Athimoolam A, Krishnan V, Azhakar R, Madhavaiah C, Verma S. A Copper-Metalated, Hybrid Inorganic-Organic Polymer as an Oxidative Nuclease. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400727] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Benson MA, Steiner A. Connecting cyclophosphazenes via ring N-centres with covalent linkers. Chem Commun (Camb) 2005:5026-8. [PMID: 16220159 DOI: 10.1039/b510898e] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two cyclotriphosphazene rings can be covalently linked via ring N-centres by a 2-butene-1,4-diyl unit and vice versa a cyclotriphosphazene molecule is able to bridge two cinnamyl groups via two ring N-centres yielding in either case dicationic assemblies which offers a route to novel polycations.
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Affiliation(s)
- Mark A Benson
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool, UK
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32
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Ainscough EW, Brodie AM, Depree CV, Moubaraki B, Murray KS, Otter CA. Copper(ii) chloride complexes with multimodal ligands based on the cyclotriphosphazene platform. Dalton Trans 2005:3337-43. [PMID: 16193152 DOI: 10.1039/b508620e] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of hexakis(2-pyridyloxy)cyclotriphosphazene (L) and hexakis(4-methyl-2-pyridyloxy)cyclotriphosphazene (MeL) with copper(ii) chloride afford the complexes [CuLCl(2)], [(CuCl(2))(2)(MeL)], [CuLCl]PF(6) and [Cu(MeL)Cl]PF(6). The single-crystal X-ray structure of [CuLCl(2)] shows the copper ion to be in a square based pyramidal distorted trigonal bipyramidal (SBPDTBP) environment (tau= 0.47) with L acting as a kappa(3)N donor, coordinating via the nitrogen atoms from two non-geminal pyridyloxy pendant arms, a nitrogen atom in the phosphazene ring and two chloride ions. In the dimetallic complex, [(CuCl(2))(2)(MeL)], the geometry about both (symmetry related) copper(ii) centres is also SBPDTBP (tau= 0.57) with a 'N(3)Cl(2)' donor set. In the monocation of [CuLCl]PF(6), L acts as a kappa(5)N donor, bonding to the copper(ii) centre through the nitrogen atoms of four pyridyloxy pendant arms, a phosphazene ring nitrogen atom and a chloride ion to give an elongated rhombic octahedral coordination sphere. The phosphazene ring atoms remain virtually coplanar in all three structures as a consequence of the phenoxy-hinge, which links the pyridine pendant donors to the cyclotriphosphazene platform, allowing the formation of six-membered chelate rings. The spectroscopic (mass spectral, EPR and electronic) and magnetic properties of the complexes are discussed. The EPR and variable temperature magnetic susceptibility results for the dicopper complex, [(CuCl(2))(2)(MeL)], point to a very weak electronic interaction between the metal atoms.
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Affiliation(s)
- Eric W Ainscough
- Chemistry-Institute of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand.
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Liu T, Neverov AA, Tsang JSW, Brown RS. Mechanistic studies of La3+- and Zn2+-catalyzed methanolysis of aryl phosphate and phosphorothioate triesters. Development of artificial phosphotriesterase systems. Org Biomol Chem 2005; 3:1525-33. [PMID: 15827652 DOI: 10.1039/b502569a] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The methanolyses of a series of O,O-diethyl O-aryl phosphates (2,5) and O,O-diethyl S-aryl phosphorothioates (6) promoted by methoxide and two metal ion systems, (La3+)2(-OCH3)2 and 4:Zn2+:-OCH3 (4 = 1,5,9-triazacyclododecane) has been studied in methanol at 25 degrees C. Brønsted plots of the logk2 values vs. pKa for the phenol leaving groups give beta(lg) values of -0.70, -1.43 and -1.12 for the methanolysis of the phosphates and -0.63, -0.87 and -0.74 for the methanolysis of the phosphorothioates promoted by the methoxide, La3+ and Zn2+ systems respectively. The kinetic data for the metal-catalyzed reactions are analyzed in terms of a common mechanism where there is extensive cleavage of the P-XAr bond in the rate-limiting transition state. The relevance of these findings to the mechanism of action of the phosphotriesterase enzyme is discussed.
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Affiliation(s)
- Tony Liu
- Department of Chemistry, Queen's University, Kingston, Ontario, Canada
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Phosphorus–nitrogen compounds. spiro- and crypta-phosphazene derivatives: synthesis and spectral investigations. Structure of butane-N,N′-bis(1,4-oxybenzyl)-spiro(propane-1,3-diamino)tetrachlorocyclo-2λ5, 4λ5, 6λ5-triphosphazatriene. Part VII. J Mol Struct 2004. [DOI: 10.1016/j.molstruc.2004.03.043] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chandrasekhar V, Deria P, Krishnan V, Athimoolam A, Singh S, Madhavaiah C, Srivatsan SG, Verma S. Metalated hybrid polymers as catalytic reagents for phosphate ester hydrolysis and plasmid modification. Bioorg Med Chem Lett 2004; 14:1559-62. [PMID: 15006403 DOI: 10.1016/j.bmcl.2003.12.082] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2003] [Revised: 12/22/2003] [Accepted: 12/22/2003] [Indexed: 11/23/2022]
Abstract
Pendant pyrazolylcyclophosphazene containing hybrid cross-linked polymer (CPPL) has been utilized for binding Zn(II). The metalated polymer (CPPL-Zn) has been found to be very effective catalyst for the hydrolysis of a RNA model phosphodiester substrate [2-(hydroxypropyl)-p-nitrophenyl phosphate, hNPP]. In addition, CPPL-Zn also cleaved supercoiled plasmid DNA pBR322 thus providing a novel structural motif of inorganic-organic hybrid polymers as synthetic nucleases.
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Neverov AA, Brown RS. Cu(ii)-Mediated decomposition of phosphorothionate PS pesticides. Billion-fold acceleration of the methanolysis of fenitrothion promoted by a simple Cu(ii)–ligand system. Org Biomol Chem 2004; 2:2245-8. [PMID: 15280962 DOI: 10.1039/b404740k] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The kinetics of methanolysis of the title compound (3) were studied in the presence of Cu(2+), introduced as Cu(OTf), in the presence of 0.5-1.0 eq. of methoxide and in the presence of 1.0 eq. of a ligand such as bipyridyl (5), phenanthroline (6) or 1,5,9-triazacyclododecane (4). In all cases the active species involve Cu(2+)((-)OCH(3)). In the case of added strong-binding ligands 5 or 6, a plot of the observed rate constant for methanolysis of 3 vs. [Cu(2+)](total) gives a curved line modelled by a process having a [Cu(2+)](1/2) dependence consistent with an active monomeric species in equilibrium with an inactive dimer i.e.[LCu(2+)((-)OCH(3))](2) <==> 2LCu(2+)((-)OCH(3)). In the case of the added strong binding ligand 4, the plot of the observed rate constant for methanolysis of 3 vs.[Cu(2+)](total) gives a straight line consistent with the catalytically active species being Cu(2+)(OCH(3)) which shows no propensity to form inactive dimers. Turnover experiments where the [3] > [Cu(2+)](total) indicate that the systems are truly catalytic. In the optimum case a catalytic system comprising 1 mM of the complex 4Cu(2+)((-)OCH(3)) catalyzes the methanolysis of 3 with a t(1/2) of approximately 58 s accounting for a 1.7 x 10(9)-fold acceleration relative to the background reaction at near neutral (s)(s)pH (8.75).
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Affiliation(s)
- Alexei A Neverov
- Department of Chemistry, Queen's University, Kingston, Ontario, CanadaK7L 3C1.
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Chandrasekhar V, Krishnan V, Steiner A, Bickley JF. Cyclotriphosphazene Hydrazides as Efficient Multisite Coordination Ligands. η3-fac-non-geminal-N3 Coordination of spiro-N3P3[O2C12H8][N(Me)NH2]4 (L) in L2CoCl3 and L2M(NO3)2 (M = Ni, Zn, Cd). Inorg Chem 2003; 43:166-72. [PMID: 14704064 DOI: 10.1021/ic034561d] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The cyclophosphazene tetrahydrazide spiro-N(3)P(3)[O(2)C(12)H(8)][N(Me)NH(2)](4) (L) functions as a multisite coordination ligand and affords L(2)CoCl(3).2CH(3)OH (4), L(2)Ni(NO(3))(2).2CHCl(3).2.5H(2)O (5), L(2)Zn(NO(3))(2).2CH(3)CN.2H(2)O (6), and L(2)Cd(NO(3))(2) (7). Each of the cyclophosphazene ligands that is involved in coordination to the metal functions as a non-geminal-N(3) donor coordinating through one ring nitrogen atom and two non-geminal-NH(2) nitrogen atoms. The coordination geometry around the metal ion in 4-6 is approximately octahedral while it is severely distorted in the case of 7.
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Chandrasekhar V, Athimoolam A, Reddy ND, Nagendran S, Steiner A, Zacchini S, Butcher R. Pendant cyclodicarbaphosphazatriene-containing monomers and polymers: synthesis, crystal structures and polymerization behavior of [NC(NMe2)]2[NP(O-C6H4-p-C6H4-p-CH=CH2)(X)], X = Cl, OCH2CF3, OC6H5, OC6H4-m-CH3, OC6H4-p-Br. Inorg Chem 2003; 42:51-9. [PMID: 12513077 DOI: 10.1021/ic025940u] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of the dicarbaphosphazene, [NC(NMe(2))](2)[NPCl(2)] (2), with the sodium salt of 4-hydroxy-4'-vinylbiphenyl afforded the vinyl group containing monomer [NC(NMe(2))](2)[NP(Cl)(O-C(6)H(4)-p-C(6)H(4)-p-CH=CH(2))] (3). Replacement of the lone chlorine atom of 3 by oxygen nucleophiles gave [NC(NMe(2))](2)[NP(OR)(O-C(6)H(4)-p-C(6)H(4)-p-CH=CH(2))] [R = CH(2)CF(3) (4); C(6)H(5) (5); C(6)H(4)-m-CH(3) (6); C(6)H(4)-p-Br(7)]. The X-ray crystal structures of 3-7 reveal that all the cyclodicarbaphosphazenes have a planar N(3)PC(2) ring; the ring carbons are completely planar, while the geometry around phosphorus is pseudotetrahedral. The presence of weak intermolecular hydrogen bonding [C-H---X(Cl or Br), C-H---N, or C-H---pi] interactions in 3-7 leads to the formation of polymeric architectures in the solid-state. The monomers 4-7 can be polymerized by a free-radical initiator to afford the corresponding air-stable homopolymers 8-11. These have moderate molecular weights with polydispersity indices ranging from 1.33 to 1.58. All of these polymers have high glass transition temperatures and have excellent thermal stability.
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