0000000000060490

AUTHOR

Katharina Mack

showing 9 related works from this author

Structure and Electronic Properties of an Expanded Terpyridine Complex of Nickel(II) [Ni(ddpd)2](BF4)2

2018

Ligand field theory010405 organic chemistrychemistry.chemical_element010402 general chemistry01 natural sciences0104 chemical sciencesInorganic ChemistryNickelchemistry.chemical_compoundCrystallographychemistrySpin-flipTerpyridineElectronic propertiesZeitschrift für anorganische und allgemeine Chemie
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A Heteroleptic Push-Pull Substituted Iron(II) Bis(tridentate) Complex with Low-Energy Charge-Transfer States

2014

A heteroleptic iron(II) complex [Fe(dcpp)(ddpd)](2+) with a strongly electron-withdrawing ligand (dcpp, 2,6-bis(2-carboxypyridyl)pyridine) and a strongly electron-donating tridentate tripyridine ligand (ddpd, N,N'-dimethyl-N,N'-dipyridine-2-yl-pyridine-2,6-diamine) is reported. Both ligands form six-membered chelate rings with the iron center, inducing a strong ligand field. This results in a high-energy, high-spin state ((5) T2 , (t2g )(4) (eg *)(2) ) and a low-spin ground state ((1) A1 , (t2g )(6) (eg *)(0) ). The intermediate triplet spin state ((3) T1 , (t2g )(5) (eg *)(1) ) is suggested to be between these states on the basis of the rapid dynamics after photoexcitation. The low-energy …

Ligand field theorySpin statesLigandOrganic ChemistryGeneral ChemistryPhotochemistryElectrochemistryCatalysislaw.inventionCrystallographychemistry.chemical_compoundchemistrylawExcited statePyridineGround stateElectron paramagnetic resonanceChemistry - A European Journal
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Effect of chelate ring expansion on Jahn-Teller distortion and Jahn-Teller dynamics in copper(II) complexes.

2012

The expanded ligand N,N'-dimethyl-N,N'-dipyridin-2-yl-pyridin-2,6-diamine (ddpd) coordinates to copper(II) ions in a meridional fashion giving the dicationic complex mer-[Cu(ddpd)(2)](BF(4))(2) (1). In the solid state at temperatures below 100 K the cations of 1 localize in Jahn-Teller elongated CuN(6) polyhedra with the longest Cu-N bond pointing in the molecular x or y directions while the z axis is constrained by the tridentate ddpd ligand. The elongated polyhedra are ordered in an antiferrodistortive way giving an idealized zincblende structure. At higher temperature dynamically averaged (fluxional) polyhedra in the molecular x/y directions are observed by multifrequency variable temper…

LigandJahn–Teller effectchemistry.chemical_elementZonal and meridionalOrbital overlapRing (chemistry)Copperlaw.inventionIonInorganic ChemistryCrystallographychemistrylawPhysical and Theoretical ChemistryElectron paramagnetic resonanceInorganic chemistry
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Coordination of expanded terpyridine ligands to cobalt

2013

Abstract The tridentate expanded terpyridine-like ligand N,N′-dimethyl-N,N′-dipyridin-2-yl-pyridin-2,6-diamine (ddpd) and [Co(H2O)6](BF4)2 give the high-spin complex mer-[Co(ddpd)2](BF4)2 with a tetragonally compressed CoN6 coordination geometry according to X-ray diffraction and SQUID measurements. UV–Vis–NIR spectra indicate a large ligand field splitting close to the high-spin/low-spin crossover point. Oxidation of the CoII complex to CoIII is achieved with silver triflate. The self exchange between high-spin CoII and low-spin CoIII is slow on the NMR time scale.

Ligand field theoryChemistryMagnetismLigandInorganic chemistrychemistry.chemical_elementRedoxInorganic ChemistryCrystallographychemistry.chemical_compoundMaterials ChemistryPhysical and Theoretical ChemistryTerpyridineCobaltTrifluoromethanesulfonateCoordination geometryPolyhedron
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CCDC 1016554: Experimental Crystal Structure Determination

2014

Related Article: Andreas K. C. Mengel, Christoph Förster, Aaron Breivogel, Katharina Mack, Julian R. Ochsmann, Frédéric Laquai, Vadim Ksenofontov, Katja Heinze|2015|Chem.-Eur.J.|21|704|doi:10.1002/chem.201404955

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parametersbis((pyridine-26-diyl)bis((pyridin-2-yl)methanone))-iron bis(hexafluorophosphate) acetonitrile solvateExperimental 3D Coordinates
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CCDC 1829268: Experimental Crystal Structure Determination

2018

Related Article: Matthias Dorn, Katharina Mack, Luca M. Carrella, Eva Rentschler, Christoph Förster, Katja Heinze|2018|Z.Anorg.Allg.Chem.|644|706|doi:10.1002/zaac.201800101

Space GroupCrystallographyCrystal Systembis[N2N6-dimethyl-N2N6-bis(pyridin-2-yl)pyridine-26-diamine]-nickel(ii) bis(tetrafluoroborate) acetonitrile solvateCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1016552: Experimental Crystal Structure Determination

2014

Related Article: Andreas K. C. Mengel, Christoph Förster, Aaron Breivogel, Katharina Mack, Julian R. Ochsmann, Frédéric Laquai, Vadim Ksenofontov, Katja Heinze|2015|Chem.-Eur.J.|21|704|doi:10.1002/chem.201404955

Space GroupCrystallographyCrystal SystemCrystal Structurebis(NN'-dimethyl-NN'-di(pyridin-2-yl)pyridine-26-diamine)-iron bis(hexafluorophosphate) acetonitrile solvateCell ParametersExperimental 3D Coordinates
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CCDC 1016553: Experimental Crystal Structure Determination

2014

Related Article: Andreas K. C. Mengel, Christoph Förster, Aaron Breivogel, Katharina Mack, Julian R. Ochsmann, Frédéric Laquai, Vadim Ksenofontov, Katja Heinze|2015|Chem.-Eur.J.|21|704|doi:10.1002/chem.201404955

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameters(NN'-dimethyl-NN'-di(pyridin-2-yl)pyridine-26-diamine)-((pyridine-26-diyl)bis((pyridin-2-yl)methanone))-iron bis(hexafluorophosphate) acetonitrile solvateExperimental 3D Coordinates
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CCDC 1016551: Experimental Crystal Structure Determination

2014

Related Article: Andreas K. C. Mengel, Christoph Förster, Aaron Breivogel, Katharina Mack, Julian R. Ochsmann, Frédéric Laquai, Vadim Ksenofontov, Katja Heinze|2015|Chem.-Eur.J.|21|704|doi:10.1002/chem.201404955

bis(NN'-dimethyl-NN'-di(pyridin-2-yl)pyridine-26-diamine)-iron bis(tetrafluoroborate) acetonitrile solvateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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