IISER Mohali, Knowledge city, Sector 81, SAS Nagar, Manauli PO 140306

Dr. Sanjay Singh
Associate Professor, Chemical Sciences

Email     sanjaysingh(AT)iisermohali.ac.in
Phone    +91 172 2293189
Fax    +91 172 2240266
Personal Page    http://sanjaysinghiiser.weebly.com                                                      
Research Area
Organometallic Synthesis and catalysis
Research Focus

Major Research Projects:

Organometallic Chemistry of Main Group Elements and Cationic Organo-aluminum Complexes: Chemistry of highly reactive organo-main group ionic compounds and late transition metals supported by bulky iminophosphonamide ligands with N2P or N,3P2 skeleton is the major emphasis of this research. Recently discovered series of cationic aluminum complexes exhibit very strong Lewis acid character and have been useful in promoting/catalyzing organic reactions mediated by Lewis acids. The multiply bonded terminal boron-chalcogen complexes have been important breakthrough in field.

Low Valent Complexes of Group 13 and 14 Elements: Synthesis of novel germylene, stannylene chelate compounds stabilized by bis(phosphinimino)amide is under investigation. The successful synthesis of Ge(II) and Sn(II) compounds has opened up a new opportunity to explore not only reduction of these divalent species (to prepare zero valent species) but also the oxidation reactions (to new interesting derivatives of the unknown tetravalent metal centers).

N-heterocyclic Carbene Complexes of Transition Elements for Catalysis: We have synthesized novel pincer type/tripodal N-heterocyclic carbenes bearing chalcogens in their backbone. Transition metal complexes of these carbenes are being investigated for their structure and reactivity. Recently, we have also discovered that Au(III) and Pd(II) complexes prepared in this project show excellent activity for C-H activation in aromatic rings and promising C-C coupling reactions.

Inorganic Macrocycles and Cryptands: Synthesis of phosphazane based and boron-amide based organic-inorganic hybrid macrocycles and cryptands are major theme of this research area. We have successfully assembled a series of new pyridinophanes and cryptands. Study of host-guest complexation and use of cations, anions or neutral molecules as templates in assembling macrocycles and cryptands are important aspect of our work. The phosphazene templated macrocyclic arrangement of NaCl is a landmark in this area.


Selected Publications

  • A Modular Approach to Inorganic Phosphazane Macrocycles, A. J. Plajer, R. Garcia-Rodriguez, C. G. M. Benson, P. D. Matthews, A. D. Bond, S. Singh, L. H. Gade, D. S. Wright, Angew. Chem. Int. Ed. 2017, DOI: 10.1002/anie.201702558.
  • Hg(II) and Pd(II) Complexes with a New Selenoether Bridged Biscarbene Ligand: Efficient Mono- and Bis-arylation of Methyl Acrylate with a Pincer Biscarbene Pd(II) Precatalyst, Rishu, B. Prashanth, D. Bawari, U. Mandal, A. Verma, A. R. Choudhury, S. Singh, Dalton Trans. 2017, 46, 6291-6302.
  • Heteroleptic Iminophosphonamide In(III) Complexes: Source of Mild Lewis Acid Indium Centers, B. Prashanth, D. Bawari, S. Singh, ChemistrySelect, 2017, 2, 2039-2043.
  • Mononuclear Neutral Boron Hydrides Affordable as [N,N’] Chelates of Iminophosphonamides. B. Prashanth, N. K. Srungavruksham, S. Singh ChemistrySelect, 2016, 1, 3601-3606.
  • A Versatile Hard-soft N/S-ligand for Metal Coordination and Cluster Formation, C. G. M. Benson, A. J. Plajer, R. Garcia-Rodriguez, A. D. Bond, S. Singh, L. H. Gade, D. S. Wright, Chem. Commun. 2016, 52, 9683-9686.
  • Two Different Pathways in the Reduction of [(S=)PCl(μ-NtBu)]2 with Na, D. Bawari, B. Prashanth, S. Ravi, K. R. Shamasundar, S. Singh, D. S. Wright Chem.-Eur. J. 2016, 22, 12027-12033. Hot Paper. Featured on the cover page of the issue.
  • Fine Tuning of Lewis Acidity: The Case of Borenium Hydride Complexes Derived from Bis(phosphinimino)amide Boron Precursors. K. Jaiswal, B. Prashanth, S. Singh Chem.-Eur. J. 2016, 22, 11035-11041.
  • Concise Access to Iminophosphonamide Stabilized Heteroleptic Germylenes: Chemical Reactivity and Structural Investigation. B. Prashanth, S. Singh, Dalton Trans. 2016, 45, 6079-6087. Invited article for the themed issue of Dalton Transactions on Main Group Transformations.
  • Reactivity of a dihydroboron species: Synthesis of a hydroborenium complex and an expedient entry to stable thioxo- and selenoxo-boranes, K. Jaiswal, B. Prashanth, S. Ravi, K. R. Samasundar, S. Singh Dalton. Trans. 2015, 44, 15779-15785.
  • Co(II), Ni(II) and Cu(II) Complexes of Sterically Encumbered N-arylimidoylamidine Based [N,N’] Chelating Ligands, B. Prashanth, S. Singh, A. Verm Polyhedron, 2015, 99, 17-25.
  • Bis(phosphinimino)amide Supported Borondihydride Compound and Heteroleptic dihalo Compounds of Group 13, K. Jaiswal, B. Prashanth, D. Bawari, S. Singh, Eur. J. Inorg. Chem. 2015, 2565-2673.
  • A New Bulky Iminophosphonamide as an N,N’-chelating Ligand: Synthesis and Structural Characterization of Heteroleptic Group 13 Elements Complexes, B. Prashanth, S. Singh, Dalton Trans. 2014, 43, 16880-16888.

 

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