Supramolecular Organic and Organometallic Chemistry Centre

Abstract
The organometallic chemistry of tin, particularly the investigation of the compounds with direct metal-carbon bond, is an attractive research field, the interest shown by the international scientific community this topic being justified by the outstanding results obtained in a large variety of areas, both of fundamental (the nature of the metal-carbon bond, unusual organometallic species, ligands in the coordination chemistry of the transition metals, supramolecular associations, etc.) and applied interest (polymerization catalysts, specific reagents in organic synthesis, precursors for unconventional materials, biologically active compounds, etc.). The proposed research activities will be focused on:

• design, synthesis and the characterization of the organic iminic ligands that exhibit intra- and intermolecular coordination abilities, with one or more C=N bond;
• design of compounds of the type R_nSnX_4-n, R_mR'_nSnCl_4-(m+n) [R = the above mentioned iminic ligands with one C=N bond; R' = 2-(Me₂NCH₂)C₆H₄, organic group], characterization in the solid state and the study of their dynamical behaviour in solution;
• design of compounds of the type X_4-(n+m)R'_mSnR_nSnR'_mX_4-(n+m) [R = the above mentioned iminic ligands with more than one C=N bond; R' = 2-(Me₂NCH₂)C₆H₄, organic group; n = 1-4, m = 0-3, 2 ≤ n+m ≤ 4], characterization in the solid state and the study of their dynamical behaviour in solution;
• investigation of the chemical reactivity of these compounds (e.g. halogen exchange, reactions with inorganic salts), synthesis and characterization of stable, water soluble organometallic species (carbonates, nitrates, phophates, etc.).

Results
Articles published

1. Structural diversity of coordination cores in new homoleptic tetraaryltin(IV) dioxolane, aldehyde and imines. First octacoordinated double helicate tetraorganotin(IV) compound.
   Ioana Barbul, Richard A. Varga, Cristian Silvestru, Eur. J. Inorg. Chem. 2013, 3146–3154. DOI: 10.1002/ejic.201300245.
   Cover Picture: Eur. J. Inorg. Chem. 18/2013, DOI: 10.1002/ejic.201390078
   Cover Profile: Eur. J. Inorg. Chem. 18/2013, DOI: 10.1002/ejic.201300437
   
   
2. Di(imino)aryltin(IV) dichlorides as tectons for heterometallic coordination compounds.
   Ioana Barbul, Richard A. Varga, Kieran C. Molloy, Cristian Silvestru, Dalton Trans., 2013, 42, 15427–15436. DOI: 10.1039/C3DT52022F
   Selected as HOT Article for September: hot-articles-for-september
   
   
3. [2-(Me₂NCH₂)C₆H₄]SnMeCl₂ and its hydrolysis product, [{2-(Me₂NCH₂)C₆H₄}SnMe(OH)(OH₂)]₂²⁺·2Br^- - Solution and solid state characterization.
   Adrian-A. Someșan, Richard A. Varga, Cristian Silvestru, Rev. Roum. Chim., 2014, 59, 931–938.
   
   
4. Molecular structure of [SnCl₄(N=CH-C₆H₅)(2,6-iPr₂)C₆H₃], a tin tetrachloride complex with an (imino)aryl ligand.
   Ioana Barbul, Richard A. Varga, Rev. Roum. Chim., 2015, 60(7-8), 845–848.
   
   
5. Triorganotin(IV) halides – precursors for new organotin(IV) tectons. Synthesis and structural characterization of [2-{(CH₂O)₂CH}C₆H₄]₃SnI and [2-(O=CH)C₆H₄]₃SnCl.
   Adrian-A. Someșan, Cristian Silvestru, Richard A. Varga, Rev. Roum. Chim., 2015, 60(11-12), 1097–1106.
   
   
6. Novel mono- and bimetallic organotin(IV) compounds as potential linkers for coordination polymers
   Adrian-A. Someșan, Ioana Barbul, Sabina-M. Vieriu, Richard A. Varga, Cristian Silvestru, Dalton Trans., 2019, 48, 6527–6538.
   DOI: 10.1039/c9dt00817a
   
   
7. Synthesis and characterization of novel homobimetallic organotin(IV) compounds
   Adrian-A. Someșan, Ioana Barbul, Sabina-M. Vieriu, Richard A. Varga, Rev. Roum. Chim., 2020, 65(7-8), 725–733.
   DOI: 10.33224/rrch.2020.65.7-8.11
   
   

Conferences attended in 2012

1. Hypercoordinated organotin(IV) compounds with new pendant arm ligands,
   Ioana Barbul, Richard A. Varga, Cristian Silvestru
   at The XXV International Conference on Organometallic Chemistry (ICOMC), Lisbon (Portugal), September 2-7 2012.
   
   

Conferences attended in 2013

1. New hypervalent organotin derivatives containing [2-(Me₂NCH₂)C₆H₄] moieties,
   A. Somesan, L. Buta,
   at The 10^th edition of the International Conference "Students for Students", Cluj-Napoca (Romania), 10-14 April 2013.
   
   
2. New organotin(IV) halides as tectons for heterometallic coordination compounds,
   I. Barbul, R. A. Varga, C. Silvestru
   at 20^th EuCheMS Conference on Organometallic Chemistry, St Andrews (Scotland), 30 June - 4 July 2013.

Conferences attended in 2014

1. Compusi staniu(IV) organici care contin liganzi cu brate pendante,
   R. A. Varga
   at Zilele Academice Clujene, Cluj-Napoca (Romania), 5 July 2014.
   
   
2. Organotin(IV) compounds containing ligands with donor atoms,
   A.-A. Someșan
   at The 11^th edition of the International Conference "Students for Students", Cluj-Napoca (Romania), 09 - 13 April 2014.
   Presentation awarded with "Premiul Societatii de Chimie din Romania".
   

Contributions to PhD Theses

• Ioana Barbul, Studies in organotin chemistry.
  PhD Thesis elaborated under the supervision of Prof. Dr. Cristian Silvestru and defended in September 2012.