Thomas Zöller
Technical University of Dortmund
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Featured researches published by Thomas Zöller.
Inorganic Chemistry | 2012
Thomas Zöller; Christina Dietz; Ljuba Iovkova-Berends; Olga Karsten; Gerrit Bradtmöller; Ann-Kristin Wiegand; Yu Wang; Viatcheslav Jouikov; Klaus Jurkschat
The syntheses of the stannatrane derivatives of the type N(CH(2)CMe(2)O)(3)SnX (1, X = Ot-Bu; 2, X = Oi-Pr; 3, X = 2,6-Me(2)C(6)H(3)O; 4, X = p-t-BuC(6)H(4)O; 5, X = p-NO(2)C(6)H(4)O; 6, X = p-FC(6)H(4)O; 7, X = p-PPh(2)C(6)H(4)O; 8, X = p-MeC(6)H(4)S; 9, X = o-NH(2)C(6)H(4)O; 10, X = OCPh(2)CH(2)NMe(2); 11, X = Ph(2)P(S)S; 12, X = p-t-BuC(6)H(4)C(O)O; 13, X = Cl; 14, X = Br; 15, X = I; 16, X = p-N(CH(2)CMe(2)O)(3)SnOSiMe(2)C(6)H(4)SiMe(2)O) are reported. The compounds are characterized by X-ray diffraction analyses (3-8, 11-16), multinuclear NMR spectroscopy, (13)C CP MAS (14) and (119)Sn CP MAS NMR (13, 14) spectroscopy, mass spectrometry and osmometric molecular weight determination (13). Electrochemical measurements show that anodic oxidation of the stannatranes 4 and 8 occurs via electrochemically reversible electron transfer resulting in the corresponding cation radicals. The latter were detected by cyclic voltammetry (CV) and real-time electron paramagnetic resonance spectroscopy (EPR). DFT calculations were performed to compare the stannatranes 4, 8, and 13 with the corresponding cation radicals 4(+•), 8(+•), and 13(+•), respectively.
Inorganic Chemistry | 2011
Thomas Zöller; Ljuba Iovkova-Berends; Thorsten Berends; Christina Dietz; Gerrit Bradtmöller; Klaus Jurkschat
The syntheses and molecular structures of the intramolecularly coordinated tin(II) compounds {CH(2)N(Me)CH(Me)CH(Ph)O}(2)SnL (2, L = lone pair; 4, L = W(CO)(5); 5, L = Cr(CO)(5)) and of the related hydroxido-substituted tin(IV) compound [{CH(2)N(Me)CH(Me)CH(Ph)O}(2)Sn(OH)](2)O, 6a, are reported. Also reported are the molecular structures of the enantiopure N,N-ethylenebis-(1R,2S)-ephedrine, {CH(2)N(Me)CH(Me)CH(Ph)OH}(2) (1), and its hydrobromide {CH(2)N(Me)CH(Me)CH(Ph)OH}(2)·HBr (1a).
Inorganic Chemistry | 2013
Thomas Zöller; Klaus Jurkschat
The syntheses of the novel alkanolamine N(CH(2)CMe(2)OH)(2)(CH(2)CH(2)CH(2)OH) (2), the novel aminotrialkoxides of tin of the type [N(CH(2)CMe(2)O)(2)(CH(2))(n)OSnOR](m) (3: m = 1, n = 2, R = t-Bu; 4: m = 2, n = 3, R = t-Bu; 5: m = n = 2, R = 2,6-Me(2)C(6)H(3); 6: m = 2, n = 3, R = 2,6-Me(2)C(6)H(3)) and the related trinuclear tin oxoclusters [(LSnOSnL)(LSnOR)] [L = N(CH(2)CMe(2)O)(2)(CH(2)CH(2)O), 7: R = t-Bu; 8: R = 2,6-Me(2)C(6)H(3)] and the pentanuclear tin oxocluster [LSnOSn(OH)(2)OSnL·2LSnOH], [9, L = N(CH(2)CMe(2)O)(2)(CH(2)CH(2)O)] are reported. The compounds are characterized by elemental analyses, multinuclear ((1)H, (13)C, (119)Sn, (1)H-(1)H cosy, (1)H-(13)C HSQC) NMR spectroscopy, electrospray ionization mass spectrometry, and single crystal X-ray diffraction analyses (3, 4·C(7)H(8), 5, 7, 8·0.5C(7)H(8), 9·6H(2)O).
Molecules | 2011
Ljuba Iovkova-Berends; Carmen Wängler; Thomas Zöller; Georg Höfner; Klaus Theodor Wanner; Christian Rensch; Peter Bartenstein; Alexey Kostikov; Ralf Schirrmacher; Klaus Jurkschat; Björn Wängler
The synthesis, radiolabeling and in vitro evaluation of new silicon-fluoride acceptor (SiFA) derivatized D2-receptor ligands is reported. The SiFA-technology simplifies the introduction of fluorine-18 into target specific biomolecules for Positron-Emission-Tomography (PET). However, one of the remaining challenges, especially for small molecules such as receptor-ligands, is the bulkiness of the SiFA-moiety. We therefore synthesized four Fallypride SiFA-conjugates derivatized either directly at the benzoic acid ring system (SiFA-DMFP, SiFA-FP, SiFA-DDMFP) or at the butyl-side chain (SiFA-M-FP) and tested their receptor affinities. We found D2-receptor affinities for all compounds in the nanomolar range (Ki(SiFA-DMFP) = 13.6 nM, Ki(SiFA-FP) = 33.0 nM, Ki(SiFA-DDMFP) = 62.7 nM and Ki(SiFA-M-FP) = 4.21 nM). The radiofluorination showed highest yields when 10 nmol of the precursors were reacted with [18F]fluoride/TBAHCO3 in acetonitrile. After a reversed phased cartridge purification the desired products could be isolated as an injectable solution after only 10 min synthesis time with radiochemical yields (RCY) of more than 40% in the case of SiFA-DMFP resulting in specific activities >41 GBq/µmol (>1,100 Ci/mmol). Furthermore, the radiolabeled products were shown to be stable in the injectable solutions, as well as in human plasma, for at least 90 min.
Main Group Metal Chemistry | 2013
Thomas Zöller; Michael Lutter; Thorsten Berends; Klaus Jurkschat
Abstract The synthesis of the 2,8-dioxa-5-aza-1-stanna-bicyclo[3.3.01.5]octane [PhN(CH2CH2O)2Sn]n (3) by a combined ligand exchange/redox reaction and independently by the reaction of tin(II)butoxide with N-phenyldiethanolamine is reported. Compound 3 was characterized by elemental analysis and single crystal X-ray diffraction analysis. In the solid state, it is a coordination polymer via intermolecular O→Sn interactions at O-Sn distances of 2.325 (3) and 2.379 (3) Å. The intramolecular N→Sn interactions at distances of 2.818 (3) and 3.096 (3) Å are rather weak.
Main Group Metal Chemistry | 2015
Michael Wagner; Thomas Zöller; Christina Dietz; Klaus Jurkschat
Abstract The isolation and molecular structure of bis(di-iso-propoxyphosphonyl)-4-tert-butyl]phenyl}tin triphenylphosphane perchlorate chromium pentacarbonyl, 2, is reported. It is the first example of an ionic compound containing an organostannylene transition metal complex cation stabilized by a phosphane donor. Slow reaction of compound 2 in acetonitrile gave trans-bis-triphenylphosphane chromium tetracarbonyl, trans-(Ph3P)2Cr(CO)4, in a new crystalline modification.
Chemistry: A European Journal | 2018
Thomas Zöller; Christina Dietz; Florian Winter; Rainer Pöttgen; Serge I. Gorelsky; Alexander Hoffmann; Sonja Herres-Pawlis; Klaus Jurkschat
Syntheses and molecular structures of the dimeric tin-platinum complex [LSnPtCl2 (SMe2 )]2 (2), the tin-platinum clusters [{LSnPtCl(SMe2 )}2 SnCl2 )] (3) and [(LSn)3 (PtCl2 )(PtClSnCl)(LSnOHCl)] (6) (L=MeN(CH2 CMe2 O- )2 ), and of the unprecedented tin(II) aminoalkoxide-tin oxide chloride complex [O(SnCl)2 ⋅(SnL)2 ] (5) are reported. The compounds were characterized by NMR spectroscopy (1 H, 13 C, 119 Sn, 195 Pt), 119 Sn Mössbauer spectroscopy (1-3, 6), electrospray ionization mass spectrometry, elemental analyses, and single-crystal X-ray diffraction analyses (2⋅CH2 Cl2 , 3⋅2u2009C4 H8 O, 5, 6⋅3CH2 Cl2 ). The tin(II) aminoalkoxide [MeN(CH2 CMe2 O)2 Sn]2 (1) behaves like a neutral ligand, inserts into a Pt-Cl bond, or is involved in rearrangement reactions with the different behavior occurring even within one compound (3, 6). DFT calculations show that the tin-platinum compounds behave like electronic chameleons.
Chemistry: A European Journal | 2011
Thomas Zöller; Ljuba Iovkova-Berends; Christina Dietz; Thorsten Berends; Klaus Jurkschat
Chemistry: A European Journal | 2013
Michael Wagner; Thomas Zöller; Wolf Hiller; Marc H. Prosenc; Klaus Jurkschat
Chemical Communications | 2013
Michael Wagner; Thomas Zöller; Wolf Hiller; Marc H. Prosenc; Klaus Jurkschat