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IPB Newsletter | April 2025
Understanding Plants!

The IPB Video
Molecular Signal Processing

Prof. Dr. Steffen Abel
How plants stand their ground.
Bioorganic Chemistry

Prof. Dr. Ludger Wessjohann
The chemistry of nature - basis for active compounds for human and plant health.
Biochemistry of Plant Interactions

Prof. Dr. Tina Romeis
Interactions in, of and with plants.
Cell and Metabolic Biology

Prof. Dr. Alain Tissier
Secondary but never unimportant - the biological functions of plant secondary metabolites.
Independent Junior Research Group

Dr. Mariana Schuster

New findings on OPDA: No signaling effect in the early wound response

The plant stress hormone jasmonic acid (JA) and its bioactive form jasmonoyl isoleucine (JA-Ile) play a central role in the…

The IPB has once again been recognized for its exemplary actions in terms of equal opportunity-oriented personnel and organizational policies and has received the TOTAL E-QUALITY certification for the…

The Plant Science Student Conference (PSSC) has been organised by students from the two Leibniz institutes, IPK and IPB, every year for the last 20 years. In this interview, Christina Wäsch (IPK) and…

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Synthetic Organic Chemist (m/f/d) (18/2025)

Date: 2025-08-19 Reference Number: 18/2025

PhD position in biology (m/f/d) (17/2025)

Date: 2025-08-08 Reference Number: 17/2025

PhD in Machine Learning for Enzyme Design (m/f/d)

Date: 2025-05-16 Reference Number: 11/2025

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Publications

Kluge, T.; Bette, M.; Rüffer, T.; Bruhn, C.; Wagner, C.; Ströhl, D.; Schmidt, J.; Steinborn, D.; Activation of Acetyl Ligands through Hydrogen Bonds: A New Way to Platinum(II) Complexes Bearing Protonated Iminoacetyl Ligands Organometallics 32 7090-7106 (2013) DOI: 10.1021/om400812w

The dinuclear platina-β-diketone [Pt2{(COMe)2H}2(μ-Cl)2] (1) reacted with 2-pyridyl-functionalized monoximes and with dioximes in the presence of NaOMe to yield oxime–diacetyl platinum(II) complexes [Pt(COMe)2(2-pyCR═NOH)] (R = H, 4a; Me, 4b; Ph, 4c) and [Pt(COMe)2(HON═CR–CR═NOH)] (R/R = Me/Me, 5a; Ph/Ph, 5b; (CH2)4, 5c; NH2/NH2, 5d), respectively. The strong intramolecular O–H···O hydrogen bonds in these complexes give rise to an activation of the acetyl ligands for Schiff-base type reactions, thus forming with primary amines iminoacetyl platinum complexes [Pt(COMe)(CMe═NHR′)(2-pyCR═NO)] (R/R′ = H/Bn, 6a; Me/Bn, 6b; Ph/Bn, 6c; H/CH2CH2Ph, 6d; H/CH2CH═CH2, 6e; Bn = benzyl) and [{Pt(CMe═NHR′)2(ON═CR–CR═NO)}2] (R/R = Me/Me, 7a–d; Ph/Ph, 8a–d; (CH2)4, 9a; R′ = Bn, a; CH2CH2Ph, b; CH2CH═CH2, c; CH2CH2OH, d). The intramolecular N–H···O hydrogen bonds in type 6–9 complexes make clear that protonated iminoacetyl ligands (i.e., aminocarbene ligands) and deprotoanted oxime ligands are present. These complexes could also be obtained in reactions of [Pt(COMe)2(NH2R′)2] (3) with pyridyl-functionalized monoximes and with dioximes where type 4/5 complexes were found to be intermediates. In solution, the bis(iminoacetyl) complexes 7–9 were found to be present as dimers (as also 8a in the solid state) with smaller amounts of monomers. The importance of hydrogen bonds for activation of acetyl ligands was further evidenced by synthesis of complexes [Pt(COMe)2(2-pyCH═NOMe)] (10) and [Pt(COMe)2(HON═CMe–CMe═NOMe)] (11) bearing O-methylated oxime ligands and their reactivty toward amines. The hydrogen-bond activated acetyl and iminoacetyl ligands in type 5, 7, and 8 complexes were found to undergo in CD3OD solutions facile H/D exchange reactions resulting in complexes bearing C(CD3)═O/C(CD3)═NDR′ ligands. The constitution of all complexes was unambiguously confirmed analytically, spectroscopically and in part by single-crystal X-ray diffraction analyses. Structural and NMR parameters as well as DFT calculations gave evidence for relatively strong intramolecular hydrogen bonds.

Publications

Bette, M.; Rüffer, T.; Bruhn, C.; Schmidt, J.; Steinborn, D.; Synthesis, Characterization, and Reactivity of Diacetylplatinum(II) and -platinum(IV) Complexes Bearing κ2- and κ3-Coordinated Scorpionate Ligands Organometallics 31 3700-3710 (2012) DOI: 10.1021/om3001907

IPB Newsletter | April 2025

Understanding Plants!

Molecular Signal Processing

Bioorganic Chemistry

Biochemistry of Plant Interactions

Cell and Metabolic Biology

Independent Junior Research Group

+++ News Ticker Science 183 +++ Phytohormones +++

New findings on OPDA: No signaling effect in the early wound response

IPB receives TOTAL E-QUALITY certification for the sixth time in a row

PSSC: Success for the ‘Iron Lady’

Synthetic Organic Chemist (m/f/d) (18/2025)

PhD position in biology (m/f/d) (17/2025)

PhD in Machine Learning for Enzyme Design (m/f/d)

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