176
|
Comba P, Gahan LR, Mereacre V, Hanson GR, Powell AK, Schenk G, Zajaczkowski-Fischer M. Spectroscopic Characterization of the Active FeIIIFeIII and FeIIIFeII Forms of a Purple Acid Phosphatase Model System. Inorg Chem 2012; 51:12195-209. [DOI: 10.1021/ic301347t] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
177
|
Dokorou VN, Milios CJ, Tsipis AC, Haukka M, Weidler PG, Powell AK, Kostakis GE. Pseudopeptidic ligands: exploring the self-assembly of isophthaloylbisglycine (H2IBG) and divalent metal ions. Dalton Trans 2012; 41:12501-13. [PMID: 22955234 DOI: 10.1039/c2dt31383a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a systematic study of the complexation of the new pseudopeptidic ligand isophthaloylbisglycine (H(2)IBG) with divalent metal ions of varying ionic radius. This work represents the initial employment of H(2)IBG in the coordination chemistry of alkaline earth, 3d transition, Zn(II) and Cd(II) metal elements. Infrared, NMR, thermal, magnetic, adsorption and theoretical studies of these compounds are also discussed.
Collapse
|
178
|
Feltham HLC, Clérac R, Ungur L, Vieru V, Chibotaru LF, Powell AK, Brooker S. Synthesis and Magnetic Properties of a New Family of Macrocyclic MII3LnIII Complexes: Insights into the Effect of Subtle Chemical Modification on Single-Molecule Magnet Behavior. Inorg Chem 2012; 51:10603-12. [DOI: 10.1021/ic300819u] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
179
|
Burrows AD, Mahon MF, Sebestyen VM, Lan Y, Powell AK. Synthesis, Structures, And Magnetic Behavior of New Anionic Copper(II) Sulfate Aggregates and Chains. Inorg Chem 2012; 51:10983-9. [DOI: 10.1021/ic301478x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
180
|
Mukherjee S, Lan Y, Kostakis GE, Clérac R, Anson CE, Powell AK. Systematic investigation into the influence of base and substituents on the coordination chemistry of MnIII and MnIII/II salicylate complexes. Supramol Chem 2012. [DOI: 10.1080/10610278.2012.703323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
181
|
Ako AM, Alam MS, Mameri S, Lan Y, Hibert M, Stocker M, Müller P, Anson CE, Powell AK. Adsorption of [Mn
19
] Aggregates with
S
= 83/2 onto HOPG Surfaces. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200420] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
182
|
Mereacre V, Lan Y, Wernsdorfer W, Anson CE, Powell AK. A family of dodecanuclear Mn11Ln single-molecule magnets. CR CHIM 2012. [DOI: 10.1016/j.crci.2012.05.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
183
|
Mondal KC, Sundt A, Lan Y, Kostakis GE, Waldmann O, Ungur L, Chibotaru LF, Anson CE, Powell AK. Coexistence of Distinct Single-Ion and Exchange-Based Mechanisms for Blocking of Magnetization in a CoII2DyIII2 Single-Molecule Magnet. Angew Chem Int Ed Engl 2012; 51:7550-4. [DOI: 10.1002/anie.201201478] [Citation(s) in RCA: 255] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Indexed: 11/09/2022]
|
184
|
Mondal KC, Sundt A, Lan Y, Kostakis GE, Waldmann O, Ungur L, Chibotaru LF, Anson CE, Powell AK. Coexistence of Distinct Single-Ion and Exchange-Based Mechanisms for Blocking of Magnetization in a CoII2DyIII2 Single-Molecule Magnet. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201201478] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
185
|
Kostakis GE, Perlepes SP, Blatov VA, Proserpio DM, Powell AK. High-nuclearity cobalt coordination clusters: Synthetic, topological and magnetic aspects. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.02.002] [Citation(s) in RCA: 160] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
186
|
Pladzyk A, Ponikiewski Ł, Lan Y, Powell AK. Synthesis, structure and magnetic properties of neutral Ni (II) tri-tert-butoxysilanethiolate cluster. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2012.02.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
187
|
Abbas G, Kostakis GE, Lan Y, Powell AK. Synthesis and characterization of isostructural tetranuclear lanthanide complexes [Ln4(μ3-OH)2(ampdH4)2(piv)10]·4CH3CN (Ln=Sm, Eu, Gd, Tb, Dy, Ho, Er). Polyhedron 2012. [DOI: 10.1016/j.poly.2012.03.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
188
|
Heims F, Mereacre V, Ciancetta A, Mebs S, Powell AK, Greco C, Ray K. Synthesis and Spectroscopic Characterisation of a Heterodinuclear Iron(III)‐Copper(II) Complex Based on an Asymmetric Dinucleating Ligand System. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200156] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
189
|
Guan M, Wang W, Henderson EJ, Dag O, Kübel C, Chakravadhanula VSK, Rinck J, Moudrakovski IL, Thomson J, McDowell J, Powell AK, Zhang H, Ozin GA. Assembling photoluminescent silicon nanocrystals into periodic mesoporous organosilica. J Am Chem Soc 2012; 134:8439-46. [PMID: 22509891 DOI: 10.1021/ja209532e] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A contemporary question in the intensely active field of periodic mesoporous organosilica (PMO) materials is how large a silsesquioxane precursor can be self-assembled under template direction into the pore walls of an ordered mesostructure. An answer to this question is beginning to emerge with the ability to synthesize dendrimer, buckyball, and polyhedral oligomeric silsesquioxane PMOs. In this paper, we further expand the library of large-scale silsesquioxane precursors by demonstrating that photoluminescent nanocrystalline silicon that has been surface-capped with oligo(triethoxysilylethylene), denoted as ncSi:(CH(2)CH(2)Si(OEt)(3))(n)H, can be self-assembled into a photoluminescent nanocrystalline silicon periodic mesoporous organosilica (ncSi-PMO). A comprehensive multianalytical characterization of the structural and optical properties of ncSi-PMO demonstrates that the material gainfully combines the photoluminescent properties of nanocrystalline silicon with the porous structure of the PMO. This integration of two functional components makes ncSi-PMO a promising multifunctional material for optoelectronic and biomedical applications.
Collapse
|
190
|
Shingnapurkar D, Dandawate P, Anson CE, Powell AK, Afrasiabi Z, Sinn E, Pandit S, Venkateswara Swamy K, Franzblau S, Padhye S. Synthesis and characterization of pyruvate–isoniazid analogs and their copper complexes as potential ICL inhibitors. Bioorg Med Chem Lett 2012; 22:3172-6. [DOI: 10.1016/j.bmcl.2012.03.047] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2011] [Revised: 03/01/2012] [Accepted: 03/12/2012] [Indexed: 01/11/2023]
|
191
|
Bhunia A, Gamer MT, Ungur L, Chibotaru LF, Powell AK, Lan Y, Roesky PW, Menges F, Riehn C, Niedner-Schatteburg G. From a Dy(III) Single Molecule Magnet (SMM) to a Ferromagnetic [Mn(II)Dy(III)Mn(II)] Trinuclear Complex. Inorg Chem 2012; 51:9589-97. [DOI: 10.1021/ic300065x] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
192
|
Xiang H, Lan Y, Jiang L, Zhang WX, Anson CE, Lu TB, Powell AK. A chiral tetranuclear copper(II) complex based on a new Schiff-base ligand: Synthesis, structure, magnetic property and CD spectra. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2011.11.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
193
|
Burnham PM, Chambrier I, Hughes DL, Isare B, Poynter RJ, Powell AK, Cook MJ. Synthesis, lead lability and ring deformation of three 1,4,8,11,15,18,22,25-octasubstituted phthalocyaninato lead derivatives. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424606000570] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The syntheses and attempted syntheses of some non-peripherally (1,4,8,11,15,18,22,25) octasubstituted lead phthalocyanines from their corresponding metal-free derivatives are described. Some compounds exhibited lability of the lead ion during work-up to regenerate the starting material. The results of single crystal X-ray diffraction analyses of 1,4,8,11,15,18,22,25-octahexyl-, 1,4,8,11,15,18,22,25-octa-iso-pentyl- and 1,4,8,11,15,18,22,25-octahexylsulfanyl lead phthalocyanines are reported and cast some light on the greater stability of 1,4,8,11,15,18,22,25-octahexylsulfanyl lead phthalocyanine, in terms of ease of loss of the lead ion, over the other two substituted lead phthalocyanines studied. The phthalocyanine cores of all three derivatives adopt a saddle-shaped geometry rather than the saucer-shaped conformation exhibited by unsubstituted lead phthalocyanine. The saddle-shaped conformation would appear to offer a means of relieving steric interactions between the substituents on adjacent benzene rings. That steric interactions are a feature of these molecules is perhaps reflected in the different distortions of the saddle conformations. This is greatest for compound 1,4,8,11,15,18,22,25-octa-iso-pentyl lead phthalocyanine bearing the isopentyl groups, expected to introduce the most interactions, and least for compound 1,4,8,11,15,18,22,25-octahexylsulfanyl lead phthalocyanine where S atoms rather than methylene groups are adjacent to the benzene ring. The molecules of 1,4,8,11,15,18,22,25-octahexyl- and 1,4,8,11,15,18,22,25-octahexylsulfanyl lead phthalocyanine pack together in pairs with their nearest neighbouring molecule; their lead atoms, displaced from the core and directed towards each other. The presence of the S atoms in 1,4,8,11,15,18,22,25-octahexylsulfanyl lead phthalocyanine leads to close Pb … S contacts between the molecules. Attractive Pb … S interactions in this compound may also account for the larger displacement of the Pb from the mean-plane of the four coordinated nitrogen atoms at the centre of the phthalocyanine core than is found for 1,4,8,11,15,18,22,25-octahexyl- and 1,4,8,11,15,18,22,25-octa-iso-pentyl lead phthalocyanines. The molecular packing of 1,4,8,11,15,18,22,25-octa-iso-pentyl lead phthalocyanine is more complex because of the presence of tetrahydrofuran molecules (the solvent of recrystallisation) within the crystal, offering additional interactions with the Pb atoms.
Collapse
|
194
|
Abouelwafa AS, Anson CE, Hauser A, Patterson HH, Baril-Robert F, Li X, Powell AK. Photophysical Properties of {[Au(CN)2]−}2 Dimers Trapped in a Supramolecular Electron-Acceptor Organic Framework. Inorg Chem 2012; 51:1294-301. [DOI: 10.1021/ic201109u] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
195
|
Comba P, Gahan LR, Hanson GR, Mereacre V, Noble CJ, Powell AK, Prisecaru I, Schenk G, Zajaczkowski-Fischer M. Monoesterase activity of a purple acid phosphatase mimic with a cyclam platform. Chemistry 2012; 18:1700-10. [PMID: 22234833 DOI: 10.1002/chem.201100229] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 09/26/2011] [Indexed: 12/22/2022]
Abstract
The synthesis and characterization of a novel dinucleating ligand L (L=4,11-dimethyl-1,8-bis{2-[N-(di-2-pyridylmethyl)amino]ethyl}cyclam) and its μ-oxo-bridged diferric complex [(H(2)L){Fe(III)(2)(O)}(Cl)(4)](2+) are reported. This diiron(III) complex is the first example of a truly functional purple acid phosphatase (PAP) mimic as it accelerates the hydrolysis of the activated phosphomonoester 2,4-dinitrophenyl phosphate (DNPP). The spectroscopic and kinetic data indicate that only substrates that are monodentately bound to one of the two ferric ions can be attacked by a suitable nucleophile. This is, most probably, a terminal iron(III)-bound hydroxide. DFT calculations support this assumption and also highlight the importance of secondary interactions, exerted by the protonated cyclam platform, for the positioning and activation of the iron(III)-bound substrate. Similar effects are postulated in the native enzyme but addressed in PAP mimics for the first time.
Collapse
|
196
|
Liang L, Peng G, Li G, Lan Y, Powell AK, Deng H. In situ hydrothermal synthesis of dysprosium(iii) single-molecule magnet with lanthanide salt as catalyst. Dalton Trans 2012; 41:5816-23. [DOI: 10.1039/c2dt30175j] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
197
|
Novitchi G, Pilet G, Ungur L, Moshchalkov VV, Wernsdorfer W, Chibotaru LF, Luneau D, Powell AK. Heterometallic CuII/DyIII 1D chiral polymers: chirogenesis and exchange coupling of toroidal moments in trinuclear Dy3 single molecule magnets. Chem Sci 2012. [DOI: 10.1039/c2sc00728b] [Citation(s) in RCA: 127] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
198
|
Konidaris KF, Morrison CN, Servetas JG, Haukka M, Lan Y, Powell AK, Plakatouras JC, Kostakis GE. Supramolecular assemblies involving metal–organic ring interactions: heterometallic Cu(ii)–Ln(iii) two-dimensional coordination polymers. CrystEngComm 2012. [DOI: 10.1039/c2ce06180e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
199
|
Khan A, Lan Y, Kostakis GE, Anson CE, Powell AK. Using the flexible ligand bis(2-hydroxyethyl)amino–tris (hydroxymethyl)methane (“bis–tris”) to access a family of 3d–4f MnIII4Ln4 complexes. Dalton Trans 2012; 41:8333-9. [DOI: 10.1039/c2dt30127j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
200
|
Schmidt S, Prodius D, Novitchi G, Mereacre V, Kostakis GE, Powell AK. Ferromagnetic heteronuclear {Fe4(Er,Lu)2} cyclic coordination clusters based on ferric wheels. Chem Commun (Camb) 2012; 48:9825-7. [DOI: 10.1039/c2cc34361d] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|