Project I

Organorsenic based ligands for catalytic applications and supramolecular chemistry

We explore low valent and low coordinated arsenic compounds and their application in homogenous catalysis. The low-valent organoarsenicals are heavier analogs to well explored phosphorus compounds and provide outstanding properties such as strong π-acceptor strengths combined with large Tolman “cone” angles (Θ), however arsinines, arsaalkenes and arsoles as ligands for catalytic applications have hitherto been greatly overlooked due to falsely imposed toxicity. 

See our lates paper on arsoles, their coordination chemistry and their performance as ligands in catalysis: 

  • Gupta, A. K.; Akkarasamiyo, S.; Orthaber, A., Rich Coordination Chemistry of π-Acceptor Dibenzoarsole Ligands. Inorg. Chem. 2017, 56 (8), 4504-4511. link 

Project II

Organophosphorous and -arsenic compounds in unusual bonding situations for Organic Electronics

We explore the use of molecular main group compounds as novel building blocks for applications in organic electronics, such as thin film transistors (TFTs), organic field effect transistors (OFETs), or organic light emitting diodes (OLEDs), or electrochromic materials.

Phosphorus based systems such as phosphaalkenes and phospholes have recently attracted considerable attention as conductive materials or in lightning applications. Through collaborations with S. Spirk and Z. Zhang we investigated the use of Phosphorus-based building blocks as novel components in organic electronic devices. Recently, we have also explored low valent arsenic compounds in pi-conjugated polymers.

See our lates papers: 

  • Morales Salazar, D.; Mijangos, E.; Pullen, S.; Gao, M.; Orthaber, A. Functional small-molecules & polymers containing P=C and As=C bonds as hybrid p-conjugated materials. Chem. Comm. 2017, DOI: 10.1039/C6CC08736A link 
  • Shameem, M. A.; Esfandiarfard, K.; Öberg, E.; Ott, S.; Orthaber, A. Direct, Sequential, and Stereoselective Alkynylation of C,C-Dibromophosphaalkenes. Chem. Eur. J. 2016, 22 (30), 10614-10619. link
  • Morales Salazar, D.; Gupta, A. K.; Orthaber, A., Reactivity studies of an imine-functionalised phosphaalkene; unusual electrostatic and supramolecular stabilisation of a [sigma]2[small lambda]3-phosphorus motif via hydrogen bonding. Dalton Trans. 2018, 47 (31), 10404-10409. link

See our review:

  • Shameem, M. A.; Orthaber, A. Organophosphorus Compounds in Organic Electronics. Chem. Eur. J. 2016, 22 (31), 10718-10735 link