ИСТИНА

One of the current trends in the design of tectons for supramolecular polymers is the search for and study of molecules consisting of two linked parts - the central core and the peripheral donor groups [1]. The latter serve to coordinate exogenous ions to form the supramolecular architecture, and a central moiety spatially organizes donor sites and brings a molecule specific property necessary for the construction of a functional material. Particularly promising looks the introduction of a metal ion into the central moiety, since in this case those properties may differ significantly from the properties of pure organic tectons and can easily be varied within wide limits. Indeed, in low molecular weight (discrete) coordination and organometallic compounds, the presence of metal ion determines the existence of reversible redox transitions, selective absorption/emission of light, high/low spin transition, catalytic activity, and molecular-recognition properties. Some of these properties may be manifested then in the coordination polymer. In this report we will concentrate on a bis-formazanate type ligands and their transition metal complexes (Fig.) as potential functional metallotectons for supramolecular chemistry. The synthesis [2], structural (for Ni(II), [3]) and magnetic (for Cu(II)) peculiarities of the complexes with tetrazolium cationic and formazanate anionic ligands will be discussed in details. [1] S. Vatsadze, Current Issues in the Chemistry of Coordination Polymers, LAP LAMBERT Academic Publishing, 2011, ISBN-13: 978-3-8465-4194-4. [2] S. Vatsadze et al, Chem Heterocycl Comp, 2006, 1444-1456. [2] S. Vatsadze et al, Russ Chem Bull, 2006, 55, 1810-1818. Acknowledgements – financial support during 2003-2017 from RFBR is greatly acknowledged. e-mail: szv@org.chem.msu.ru