Photo of Randolf Kohn

Randolf Kohn

Dr

  • 1 SOUTH 1.03A

20022017
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Personal profile

Research interests

A large variety of N-substituted 1,3,5-triazacyclohexanes (R3TAC) can be easily prepared from formaldehyde and primary amines. We are investigating the general coordination chemistry with transition metal ranging from the lanthanides to zinc. We are examining the complexes mainly by X-ray crystallography, UV/visible, IR, Raman, and NMR spectroscopy.
R3TAC occupies three coordination sites of the metal with unusually small N-metal-N angles of 60-65°. This leads to low steric demand of the ligand and allows the preparation of unusual complexes and increased catalytic activity in general.

Research Interests

  • Catalysis of Polymerisation and Trimerisation of Olefin
  • Bio-Analogous Copper Complexes for Oxygen Activation
  • Transition Metal Clusters

Personal website

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  • 5 Similar Profiles
Chromium Chemical Compounds
Nuclear magnetic resonance Chemical Compounds
chromium Physics & Astronomy
Ligands Chemical Compounds
Amines Chemical Compounds
Alkenes Chemical Compounds
Polymerization Chemical Compounds
X ray crystallography Chemical Compounds

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Projects 2004 2009

HIGH RESOLUTION MASS SPECTROMETERS TO SUPPORT CHEMISTRY AT B ATH

James, T., Bull, S., Davidson, M., Frost, C., Kohn, R., Molloy, K. C., Weller, A., Whittlesey, M., Williams, J. & Willis, M. C.

9/10/068/10/09

Project: Research council

Mass spectrometers
Mass spectrometry
Spectrometers
Throughput
Electronic mail
Spectrometers
Nuclear magnetic resonance
Molecules
Nuclear magnetic resonance spectroscopy
Protons
Metals
Ligands
Oxidation
Copper
Enzymes

Research Output 2002 2017

Antibacterial Activities of New Saturated Heterocyclic Nitrogen Compounds

Lefrada, L., Köhn, R., Malki, S., Mazouz, W., Bouchemma, A. & Hadjem, M., 11 Sep 2017, In : Algerian Journal of Natural Products. 5, 2, p. 463-468

Research output: Contribution to journalArticle

Open Access
Nitrogen Compounds
Nuclear magnetic resonance
Spectrum analysis
Formaldehyde
Agar

Synthesis and antimicrobial activity of 1,3-bis-butyl-5-(4-iodophenyl)-1,3,5-triazacyclohexane

Lefrada, L., Kohn, R., Malki, S., Mazouz, W., Bouchemma, A. & Hadjem, M., 31 Mar 2017, In : Central European Journal of Chemistry. 8, 1, p. 82-84

Research output: Contribution to journalArticle

Open Access
Nuclear magnetic resonance
Formaldehyde
Spectrum analysis
Agar
Bacteria
8 Citations

Efficient 1-hexene trimerization with triazacyclohexane chromium catalysts and detailed product analysis by 13C NMR

Coxon, A. G. N. & Kohn, R. D., 6 May 2016, In : ACS Catalysis. 6, 5, p. 3008-3016 9 p.

Research output: Contribution to journalArticle

Open Access
File
Chromium
Isomers
Nuclear magnetic resonance
Catalysts
Nuclear magnetic resonance spectroscopy

The Selective Trimerisation of alpha-Olefins with Chromium Triazacyclohexane Catalysts

Coxon, A., Nov 2015, (Unpublished) 308 p.

Research output: ThesisDoctoral Thesis

File
Alkenes
Chromium
Catalysts
Labeling
Oligomerization
2 Citations

Selective trimerisation and polymerisation of ethylene: Halogenated chromium triazacyclohexane complexes as probes for an internal 'halogen effect'

Kohn, R., Coxon, A. G. N., Hawkins, C. R., Smith, D., Mihan, S., Schuhen, K., Schiendorfer, M. & Kociok-Köhn, G., 14 Dec 2014, In : Polyhedron. 84, p. 3-13 11 p.

Research output: Contribution to journalArticle

Open Access
File
Halogens
Chromium
halogens
chromium
Ethylene

Thesis

Synthesis of Novel Chromium based Catalyst Systems, and Investigation of their Activity in the Trimerisation of alpha-Olefins

Author: I'Anson, I. A., 1 Jul 2009

Supervisor: Kohn, R. (Supervisor)

Student thesis: Doctoral ThesisPhD

File

The Selective Trimerisation of alpha-Olefins with Chromium Triazacyclohexane Catalysts

Author: Coxon, A., 6 Nov 2015

Supervisor: Kohn, R. (Supervisor)

Student thesis: Doctoral ThesisPhD