0000000000248484
AUTHOR
Oliver Back
showing 16 related works from this author
Photochemistry and Redox Chemistry of an Unsymmetrical Bimetallic Copper(I) Complex
2016
The bimetallic copper(I) complex Cu2L2 (cis-1) is formed with high diasteroselectivity from [Cu(NCCH3)4][BF4] and HL (4-tert-butyl phenyl(pyrrolato-2-yl-methylene)amine) in a kinetically controlled reaction. cis-1 features a rather short Cu···Cu distance of 2.4756(6) A and is weakly emissive at room temperature in solution. Oxidatively triggered disproportionation of cis-1 yields elemental copper and the mononuclear copper(II) complex CuL2 (trans-2). One-electron reduction of trans-2 gives cuprate [2]– with a bent bis(pyrrolato) coordinated copper(I) entity. The imine donor atoms of [2]– can insert an additional copper(I) ion giving exclusively the bimetallic complex cis-1 closing the oxida…
Boosting Vis/NIR Charge-Transfer Absorptions of Iron(II) Complexes by N-Alkylation and N-Deprotonation in the Ligand Backbone.
2017
Reversing the 3MLCT / 3MC excited state order in iron(II) complexes is a challenging objective, yet would finally result in longsought luminescent transition metal complexes with an earthabundant central ion. One approach to achieve this goal is based on low-energy charge transfer absorptions in combination with a strong ligand field. Coordinating electron rich and electron poor tridentate oligopyridine ligands with large bite angles at iron(II) enables both low-energy MLCT absorption bands around 590 nm and a strong ligand field. Variations of the electron rich ligand by introducing longer alkyl substituents destabilizes the iron(II) complex towards ligand substitution reactions while hard…
Cover Feature: Alkali Blues: Blue‐Emissive Alkali Metal Pyrrolates (Chem. Eur. J. 26/2019)
2019
Reactivity of Nickel(II) Porphyrins in oCVD Processes—Polymerisation, Intramolecular Cyclisation and Chlorination
2019
Abstract Oxidative chemical vapour deposition of (5,15‐diphenylporphyrinato)nickel(II) (NiDPP) with iron(III) chloride as oxidant yielded a conjugated poly(metalloporphyrin) as a highly coloured thin film, which is potentially useful for optoelectronic applications. This study clarified the reactive sites of the porphyrin monomer NiDPP by HRMS, UV/Vis/NIR spectroscopy, cyclic voltammetry and EPR spectroscopy in combination with quantum chemical calculations. Unsubstituted meso positions are essential for successful polymerisation, as demonstrated by varying the porphyrin meso substituent pattern from di‐ to tri‐ and tetraphenyl substitution. DFT calculations support the proposed radical oxi…
Alkali Blues: Blue‐Emissive Alkali Metal Pyrrolates
2019
2-Iminopyrroles [HtBu L, 4-tert-butyl phenyl(pyrrol-2-ylmethylene)amine] are non-fluorescent π systems. However, they display blue fluorescence after deprotonation with alkali metal bases in the solid state and in solution at room temperature. In the solid state, the alkali metal 2-imino pyrrolates, M(tBu L), aggregate to dimers, [M(tBu L)(NCR)]2 (M=Li, R=CH3 , CH(CH3 )CNH2 ), or polymers, [M(tBu L)]n (M=Na, K). In solution (solv=CH3 CN, DMSO, THF, and toluene), solvated, uncharged monomeric species M(tBu L)(solv)m with N,N'-chelated alkali metal ions are present. Due to the electron-rich pyrrolate and the electron-poor arylimino moiety, the M(tBu L) chromophore possesses a low-energy intra…
Synthesis of copper(II) and gold(III) bis(NHC)-pincer complexes
2016
Abstract CuII and AuIII chlorido complexes bearing the bis(NHC) carbazolide pincer ligand (bimca) were synthesized by transmetallation from the respective lithium complex [Li(bimca)] (NHC=N-heterocyclic carbene). In the case of copper, two different molecular structures were obtained depending on the copper source. With Cu(II) chloride the paramagnetic mononuclear [Cu(bimca)Cl] complex is formed and has been characterized by EPR spectroscopy and X-ray structure analysis, while copper(I) chloride leads under oxidation to a dinuclear structure in which two cationic [CuII(bimca)] moieties are bridged by one chlorido ligand. The positive charge is compensated by the [CuCl2]− counter ion, as pro…
CCDC 1855069: Experimental Crystal Structure Determination
2019
Related Article: Oliver Back, Christoph Förster, Thomas Basché, Katja Heinze|2019|Chem.-Eur.J.|25|6542|doi:10.1002/chem.201806103
CCDC 1492154: Experimental Crystal Structure Determination
2016
Related Article: Eva Jürgens, Oliver Back, Johannes J. Mayer, Katja Heinze, Doris Kunz|2016|Z.Naturforsch.,B:Chem.Sci.|71|1011|doi:10.1515/znb-2016-0158
CCDC 1855071: Experimental Crystal Structure Determination
2019
Related Article: Oliver Back, Christoph Förster, Thomas Basché, Katja Heinze|2019|Chem.-Eur.J.|25|6542|doi:10.1002/chem.201806103
CCDC 1526745: Experimental Crystal Structure Determination
2017
Related Article: Andreas K. C. Mengel, Christian Bissinger, Matthias Dorn, Oliver Back, Christoph Förster, Katja Heinze|2017|Chem.-Eur.J.|23|7920|doi:10.1002/chem.201700959
CCDC 1855070: Experimental Crystal Structure Determination
2019
Related Article: Oliver Back, Christoph Förster, Thomas Basché, Katja Heinze|2019|Chem.-Eur.J.|25|6542|doi:10.1002/chem.201806103
CCDC 1855068: Experimental Crystal Structure Determination
2019
Related Article: Oliver Back, Christoph Förster, Thomas Basché, Katja Heinze|2019|Chem.-Eur.J.|25|6542|doi:10.1002/chem.201806103
CCDC 1492153: Experimental Crystal Structure Determination
2016
Related Article: Eva Jürgens, Oliver Back, Johannes J. Mayer, Katja Heinze, Doris Kunz|2016|Z.Naturforsch.,B:Chem.Sci.|71|1011|doi:10.1515/znb-2016-0158
CCDC 1458703: Experimental Crystal Structure Determination
2016
Related Article: Oliver Back, Jana Leppin, Christoph Förster, and Katja Heinze|2016|Inorg.Chem.|55|9653|doi:10.1021/acs.inorgchem.6b01400
CCDC 1526744: Experimental Crystal Structure Determination
2017
Related Article: Andreas K. C. Mengel, Christian Bissinger, Matthias Dorn, Oliver Back, Christoph Förster, Katja Heinze|2017|Chem.-Eur.J.|23|7920|doi:10.1002/chem.201700959
CCDC 1044691: Experimental Crystal Structure Determination
2016
Related Article: Oliver Back, Jana Leppin, Christoph Förster, and Katja Heinze|2016|Inorg.Chem.|55|9653|doi:10.1021/acs.inorgchem.6b01400