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    Synthesis and characterization of a mixed-valent Mn 11 –La 2 aggregate with benzoate

    Akhtar, Muhammad, Lan, Yanhua, Mereacre, Valeriu, AlDamen, Murad, Anson, Christopher, Powell, Annie
    Monatshefte für Chemie - Chemical Monthly, 2017, Vol.148(5), pp.887-891 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Synthesis and characterization of a mixed-valent Mn 11 –La 2 aggregate with benzoate
    Author: Akhtar, Muhammad; Lan, Yanhua; Mereacre, Valeriu; AlDamen, Murad; Anson, Christopher; Powell, Annie
    Subject: Coordination chemistry ; Metal complex ; X-ray structure determination ; Magnetic properties
    Description: A new mixed-valent Mn–Ln complex with an Mn 9 III Mn 2 II La2 core [ Mn 9 III Mn 2 II La 2 ( μ 4 - O ) 7 ( μ 3 - O ) ( μ 3 - OH ) 2 ( benzoate ) 18 ( NO 3 ) ( MeCN ) ] has been synthesized. Its magnetic characterization reveals a complex with dominating slow relaxation. In addition, alternating current (ac) susceptibility measurements reveal a frequency-dependent out-of-phase (χ′′M) signal below 4 K, suggesting the complex to be a single-molecule magnet. Graphical abstract
    Is part of: Monatshefte für Chemie - Chemical Monthly, 2017, Vol.148(5), pp.887-891
    Identifier: 0026-9247 (ISSN); 1434-4475 (E-ISSN); 10.1007/s00706-016-1820-9 (DOI)

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    Chalcogenido-Bridged Clusters by Reactions of Chalcogenostannate Salts

    Zimmermann, Christian, Anson, Christopher, Dehnen, Stefanie
    Journal of Cluster Science, 2007, Vol.18(3), pp.618-629 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Chalcogenido-Bridged Clusters by Reactions of Chalcogenostannate Salts
    Author: Zimmermann, Christian; Anson, Christopher; Dehnen, Stefanie
    Subject: Chalcogenido-bridged clusters ; chalcogenostannates ; X-ray diffractometry
    Description: Reactions of [ en H] 4 [Sn 2 S 6 ] or K 6 [Sn 2 Te 6 ] with [Cp*CoCl] 2 (Cp* = C 5 Me 5 ), or [ en H] 4 [Sn 2 Se 6 ]· en ( en  = 1,2-diaminoethane) with [{CpFe(CO) 2 } 2 SnCl 2 ] leads to the formation of three chalcogenido-bridged transition metal complexes via an unusual synthesis route. [(Cp*Co) 3 ( μ 3 -S) 2 ] ( 1 ), [(Cp*Co) 3 ( μ 3 -Te) 2 ] ( 2 ), and [{CpFe(CO) 2 } 3 {CpFe(CO)}Sn 3 Se 4 ] ( 3 ) were structurally characterized by means of single-crystal X-ray diffractometry and represent previously unknown homologues of a selenium bridged analogue ( 1 or 2 ) or of Fe–S clusters ( 1 or 3 ). Compounds 1 and 2 , together with the previously reported Se analogue, show a progression from a symmetrical closo -trigonal-bipyramidal structure to the square-pyramidal structure predicted by the Wade-Mingos Rules for a 50 electron cluster.
    Is part of: Journal of Cluster Science, 2007, Vol.18(3), pp.618-629
    Identifier: 1040-7278 (ISSN); 1572-8862 (E-ISSN); 10.1007/s10876-007-0130-0 (DOI)

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    Antimycobacterial activity of mixed-ligand copper quinolone complexes

    Saha, Dilip, Padhye, Subhash, Anson, Christopher, Powell, Annie
    Transition Metal Chemistry, 2003, Vol.28(5), pp.579-584 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Antimycobacterial activity of mixed-ligand copper quinolone complexes
    Author: Saha, Dilip; Padhye, Subhash; Anson, Christopher; Powell, Annie
    Description: New mixed-ligand Cu II , complexes: [Cu(cf)(phen)Cl)](BF 4 ) · 4H 2 O (3) , [Cu(cf)(bipy)(Cl)](BF 4 ) · 2H 2 O (4) and [Cu(cf)(dafone)(Cl)](BF 4 ) · 2H 2 O (5) (cf = ciprofloxacin, phen = 1,10-phenanthroline, bipy = 2,2′-bipyridine and dafone = 4,5-diazafluoren-9-one) have been isolated and characterized by elemental analyses, i.r., u.v.–vis. spectra, magnetic susceptibility and cyclic voltammetry. Complex (4) crystallizes in the monoclinic space group P2 1 /n with a = 13.8919(13) Å, b = 14.5718(13) Å, c = 14.0725(13) Å, β = 95.150(2)°, V =2837.2(5) Å 3 . All complexes possess square-pyramidal geometry. The antimycobacterial activity of ciprofloxacin and complexes (3–5) has been evaluated against Mycobacterium smegmatis , which shows clear enhancement in the antitubercular activity upon copper complexation with N—N donors.
    Is part of: Transition Metal Chemistry, 2003, Vol.28(5), pp.579-584
    Identifier: 0340-4285 (ISSN); 1572-901X (E-ISSN); 10.1023/A (DOI)

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    Influence of ligand substitution on magnetic hyperfine interaction in Dy 6 -based single-molecule magnets/toroics

    Scherthan, Lena, Ruppert, Thomas, Peng, Yan, Baniodeh, Amer, Auerbach, Hendrik, Hochdörffer, Tim, Wolny, Juliusz, Bi, Wenli, Zhao, Jiyong, Hu, Michael, Toellner, Thomas, Alp, E., Brown, Dennis, Anson, Christopher, Powell, Annie, Schünemann, Volker
    Hyperfine Interactions, 2019, Vol.240(1), pp.1-6 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Influence of ligand substitution on magnetic hyperfine interaction in Dy 6 -based single-molecule magnets/toroics
    Author: Scherthan, Lena; Ruppert, Thomas; Peng, Yan; Baniodeh, Amer; Auerbach, Hendrik; Hochdörffer, Tim; Wolny, Juliusz; Bi, Wenli; Zhao, Jiyong; Hu, Michael; Toellner, Thomas; Alp, E.; Brown, Dennis; Anson, Christopher; Powell, Annie; Schünemann, Volker
    Subject: Time-domain Mössbauer spectroscopy/nuclear forward scattering ; Dysprosium ; Magnetic hyperfine field ; Single-molecule magnets
    Description: 161 Dy time-domain synchrotron Mössbauer spectroscopy (SMS), just recently presented as a novel tool to investigate Dy(III)-based single-molecule magnets (SMMs), has now been applied on two polynuclear Dy 6 -based wheel compounds possessing special features of single-molecule toroics (SMTs). The magnitude of the magnetic hyperfine field revealed for the Dy 6 ring system [Dy 6 (teaH) 6 (NO 3 ) 6 ]·8MeOH is with B 0  = 574.3(5) T characteristic for Dy(III) with a 6 H 15/2 ground state. The ligand substituted compound [Dy 6 (Me-teaH) 6 (NO 3 ) 6 ]·6MeCN possesses within the experimental errors the same magnetic hyperfine characteristics ( B 0  = 574.9(5) T). Consequently, the herein studied organic ligand variation has no perceptible influence on the magnetic hyperfine field sensed by the 161 Dy(III) nuclei in these particular homometallic Dy(III) 6 -wheels.
    Is part of: Hyperfine Interactions, 2019, Vol.240(1), pp.1-6
    Identifier: 0304-3843 (ISSN); 1572-9540 (E-ISSN); 10.1007/s10751-019-1669-5 (DOI)