Hans‐Jörg Himmel

Heidelberg University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Elisabeth Kaifer

Heidelberg University

859

Hubert Wadepohl

Heidelberg University

294

Olaf Hübner

Heidelberg University

267

Markus Enders

Heidelberg University

Ute Wild

Heidelberg University

Simone Leingang

Heidelberg University

M. Reinmuth

Philipps University of Marburg

Petra Walter

Heidelberg University

Hendrik Herrmann

Heidelberg University

A. Peters

University of Münster

Cooperative Institutions

Heidelberg University

148

Karlsruhe Institute of Technology

Heidelberg (Poland)

Centre National de la Recherche Scientifique

University of Oxford

Heidelberg University

Technical University of Munich

Max Planck Society

University of Edinburgh

Institute of Inorganic Chemistry of the Slovak Academy of Sciences

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

CCDC 2294990: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

Lucas Kistner Lukas M. Sigmund Fabian Frank Grieser Julian Krauß Simone Leingang

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2h13ym

Cite

Citations (0)

CCDC 2129920: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

Ute Wild Olaf Hübner Markus Enders Elisabeth Kaifer Hans‐Jörg Himmel

10.5517/ccdc.csd.cc29hc39

Cite

Citations (0)

Boron−Boron Dehydrocoupling of Boranes Initiated by Reaction with Iodine

Chemistry - A European Journal (2019)

Jana Elias Elisabeth Kaifer Hans‐Jörg Himmel

Abstract A new boron–boron dehydrocoupling strategy was established, providing convenient access to some diborane(4) compounds starting from simple borane adducts under mild conditions. In contrast to the traditional pathway using a reducing reagent, the reduction from B III to B II was paradoxically initiated by the addition of the oxidation‐reagent iodine. A reaction pathway for this unusual reaction was proposed based on quantum‐chemical calculations.

Diborane

Boranes

10.1002/chem.201900671

Cite

Citations (7)

The Doubly Base‐Stabilized Diborane(4) [HB(μ‐hpp)]₂ (hpp = 1,3,4,6,7,8‐hexahydro‐2H‐pyrimido[1,2‐a]pyrimidinate): Synthesis by Catalytic Dehydrogenation and Reactions with S₈ and Disulfides

European Journal of Inorganic Chemistry (2010)

N. Schulenberg O. Ciobanu Elisabeth Kaifer Hubert Wadepohl Hans‐Jörg Himmel

Abstract In this work we report on new experiments on the catalytic dehydrogenation of [H 2 B(μ‐hpp)] 2 leading to the doubly base‐stabilized diborane(4) [HB(μ‐hpp)] 2 featuring two hpp bridges (hpp = 1,3,4,6,7,8‐hexahydro‐2 H ‐pyrimido[1,2‐ a ]pyrimidinate) under mild conditions. Several dehydrogenation (pre)catalysts were tested. The best one turned out to be Ru 3 (CO) 12 , allowing quantitative dehydrogenation already at 60 °C. Subsequently we subjected [HB(μ‐hpp)] 2 to reactions with S 8 and disulfides (Ph 2 S 2 and Bn 2 S 2 , Bn = benzyl). Reaction with S 8 leads to oxidative insertion of one sulfur atom into the B–B bond and formation of [HB(μ‐hpp)] 2 (μ‐S). In the case of disulfides, substitution reactions leading to the doubly base‐stabilized diborane(4) species [RSB(μ‐hpp)] 2 and HB(μ‐hpp) 2 BSR (R = Ph or Bn) compete with sulfuration again leading to [HB(μ‐hpp)] 2 (μ‐S).

Diborane

Base (topology)

10.1002/ejic.201000637

Cite

Citations (59)

Mono‐ and Diprotonation of the Superbasic Bisguanidine 1,2‐Bis(N,N,N′,N′‐tetramethylguanidino)benzene (btmgb) and Pt^II and Pt^IV Complexes of Chelating Bisguanidines and Guanidinates

Chemistry - A European Journal (2008)

Anastasia Peters Ute Wild Olaf Hübner Elisabeth Kaifer Hans‐Jörg Himmel

Abstract New Pt complexes of chelating bisguanidines and guanidinate ligands were synthesized and characterized. 1,2‐Bis( N , N , N′ , N′ ‐tetramethylguanidino)benzene (btmgb) was used as a neutral chelating bisguanidine ligand, and 1,3,4,6,7,8‐hexahydro‐2 H ‐pyrimido[1,2‐ a ]pyrimidinate (hpp − ) as a guanidinate ligand. The salts [btmgbH] + [HOB(C 6 F 5 ) 3 ] − and [btmgbH 2 ]Cl 2 and the complexes [(btmgb)PtCl 2 ], [(btmgb)PtCl(dmso)] + [PtCl 3 (dmso)] − , and [(btmgb)PtCl(dmso)] + [Cl − ] were synthesized and characterized. In the [btmgbH] + cation the proton is bound to only one N atom. In the other complexes, both imine N atoms are coordinated to the Pt II , thus adopting a η 2 ‐coordinational mode. The hpp − anion, which usually prefers a bridging binding mode in dinuclear complexes, is η 2 ‐coordinated in the Pt IV complex [(η 2 ‐hpp)(hppH)PtCl 2 {N(H)C(O)CH 3 }], which is formed (in low yield) by reaction between cis ‐[(hppH) 2 PtCl 2 ] and H 2 O 2 in CH 3 CN.

10.1002/chem.200800244

Cite

Citations (49)

Copper Complexes of New Redox‐Active 4,5‐Bisguanidino‐Substituted Benzodioxole Ligands: Control of the Electronic Structure by Counter‐Ligands, Solvent, and Temperature

Chemistry - A European Journal (2016)

David Fridolin Schrempp Elisabeth Kaifer Hubert Wadepohl Hans‐Jörg Himmel

Herein, we analyze the possibility of controlling the electronic structure of mononuclear copper complexes featuring new redox-active 4,5-bisguanidino-substituted benzodioxole ligands. The nature of the guanidino groups, the anionic counter-ligands, the applied solvent (polarity), and the temperature are the parameters that decide if a CuII complex with neutral ligand unit or a CuI complex with radical monocationic ligand unit is the adequate description. Under special conditions, a temperature-dependent equilibrium of the two valence tautomeric forms (CuII /neutral ligand and CuI /radical monocationic ligand) is achieved. Removal of a ligand-centered electron from a paramagnetic CuII complex with a neutral ligand unit leads to a diamagnetic CuI complex with a dicationic ligand unit through a redox-induced electron-transfer (RIET) process.

Non-innocent ligand

Diamagnetism

10.1002/chem.201602402

Cite

Citations (40)

An orientation analysis of differently endgroup-functionalised alkanethiols adsorbed on Au substrates

Thin Solid Films (1997)

O. Dannenberger K. Weiß Hans‐Jörg Himmel B. Jäger Manfred Buck

XANES

Self-assembled monolayer

10.1016/s0040-6090(97)00280-0

Cite