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000051533 0247_ $$2DOI$$a10.1039/b515980f
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000051533 084__ $$2WoS$$aChemistry, Inorganic & Nuclear
000051533 1001_ $$0P:(DE-HGF)0$$aSaalfrank, R. W.$$b0
000051533 245__ $$aThe FeIII[FeIII(L1)2]3 star-type single-molecule magnet
000051533 260__ $$aLondon$$bSoc.$$c2006
000051533 300__ $$a2865 - 2874
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000051533 440_0 $$015301$$aDalton Transactions$$v23$$x1477-9226
000051533 500__ $$aRecord converted from VDB: 12.11.2012
000051533 520__ $$aStar-shaped complex [Fe(III)[Fe(III)(L1)2]3] (3) was synthesized starting from N-methyldiethanolamine H2L1 (1) and ferric chloride in the presence of sodium hydride. For 3, two different high-spin iron(III) ion sites were confirmed by Mössbauer spectroscopy at 77 K. Single-crystal X-ray structure determination revealed that 3 crystallizes with four molecules of chloroform, but, with only three molecules of dichloromethane. The unit cell of 3.4CHCl3 contains the enantiomers (delta)-[(S,S)(R,R)(R,R)] and (lambda)-[(R,R)(S,S)(S,S)], whereas in case of 3.3CH2Cl2 four independent molecules, forming pairs of the enantiomers [lambda-(R,R)(R,R)(R,R)]-3 and [lambda-(S,S)(S,S)(S,S)]-3, were observed in the unit cell. According to SQUID measurements, the antiferromagnetic intramolecular coupling of the iron(III) ions in 3 results in a S = 10/2 ground state multiplet. The anisotropy is of the easy-axis type. EPR measurements enabled an accurate determination of the ligand-field splitting parameters. The ferric star 3 is a single-molecule magnet (SMM) and shows hysteretic magnetization characteristics below a blocking temperature of about 1.2 K. However, weak intermolecular couplings, mediated in a chainlike fashion via solvent molecules, have a strong influence on the magnetic properties. Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) were used to determine the structural and electronic properties of star-type tetranuclear iron(III) complex 3. The molecules were deposited onto highly ordered pyrolytic graphite (HOPG). Small, regular molecule clusters, two-dimensional monolayers as well as separated single molecules were observed. In our STS measurements we found a rather large contrast at the expected locations of the metal centers of the molecules. This direct addressing of the metal centers was confirmed by DFT calculations.
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000051533 7001_ $$0P:(DE-HGF)0$$aScheurer, A.$$b1
000051533 7001_ $$0P:(DE-HGF)0$$aBernt, I.$$b2
000051533 7001_ $$0P:(DE-HGF)0$$aHeinemann, F. W.$$b3
000051533 7001_ $$0P:(DE-Juel1)VDB20976$$aPostnikov, A. V.$$b4$$uFZJ
000051533 7001_ $$0P:(DE-HGF)0$$aSchünemann, V.$$b5
000051533 7001_ $$0P:(DE-HGF)0$$aTrautwein, A. X.$$b6
000051533 7001_ $$0P:(DE-HGF)0$$aAlam, M. S.$$b7
000051533 7001_ $$0P:(DE-HGF)0$$aRupp, H.$$b8
000051533 7001_ $$0P:(DE-HGF)0$$aMüller, P.$$b9
000051533 773__ $$0PERI:(DE-600)1472887-4$$a10.1039/b515980f$$gp. 2865 - 2874$$p2865 - 2874$$q2865 - 2874$$tDalton transactions$$x1477-9226$$y2006
000051533 8567_ $$uhttp://dx.doi.org/10.1039/b515980f
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000051533 9131_ $$0G:(DE-Juel1)FUEK414$$bMaterie$$kP54$$lKondensierte Materie$$vKondensierte Materie$$x0$$zentfällt   bis 2009
000051533 9141_ $$y2006
000051533 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
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