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 SM ISO690:2012SHMATKOVA, Nаtalia, SEIFULLINA, Inna, SHISHKIN, Оleg, ZUBATIUK, Roman. X-ray structure of new Sn(IV) chelates with picolinoylhydrazones of 2-hydroxybenz- and 2-hydroxynaphtaldehydes. In: Physical Methods in Coordination and Supramolecular Chemistry, 27 septembrie - 1 octombrie 2006, Chişinău. Chisinau, Republic of Moldova: 2006, XVII, p. 178. ISBN 978-9975-62-066-6. |
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| Physical Methods in Coordination and Supramolecular Chemistry XVII, 2006 |
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Conferința "The XV-th International Conference Physical Methods in Coordination and Supramolecular Chemistry : The XVII-th Reading in memory of Acad. A.Ablov" Chişinău, Moldova, 27 septembrie - 1 octombrie 2006 | ||||||
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By interaction of SnCl4 with methanol solution of picolinoylhydrazones of 2-hydroxybenz(H2Ps) and 2-hydroxynaphtaldehydes (H2Pnf) solvated complex molecules of the identical compositions, [SnCl3(Ps⋅H)]⋅CH3OH (I) and [SnCl3(Pnf⋅H)]⋅CH3OH (II) were obtained. According to the data of the X-ray analysis the coordination polyhedron of Sn is being formed by three chlorine atoms, azomethinic N(3) nitrogen atom and two O(1) and O(2) oxygen atoms of oxyazine and oxygroups of the ligand, {SnCl3O2N} coordination core (figs.1, 2). During this process the distorted octahedra in which (for I) axial bonds Sn(1)-Cl(1) (2.447 Å) and Sn(1)-Cl(3) (2.3865 Å) are longer than equatorial bonds Sn(1)-Cl(2) (2.3684 Å), Sn(1)-O(2) (2.028 Å), Sn(1)-N(3)(2.147Å) and Sn(1)O(1)(2.123Å) are realized.figureFig. 1. Structure of [SnCl3(Ps⋅H)]⋅CH3OH (I)Fig. 2. Structure of [SnCl3(PnfH)]CH3OH (II) Ligands are coordinated particularly in enolic form: for (I) d[N(2)-C(6)]=1.307Å, d[C(6)O(1)]=1.305Å (average statistic values d(C=N)=1.279Å, d(C=O) in urea 1.265Å). The crystals of (I) and (II) are not isostructural, the system is monoclinic for (I) and triclinic for (II). The comparison of structures of complexes (I), (II) with synthesized earlier [GeCl2(CH3OH)(Ps⋅HCl)] compound has been carried out. Coordination of hydrazone with protonated on nitrogen form with positive charge Ps⋅H+ is common for them. However, the compensation of the latter is different: in the case of (I), (II) – by negative charge of the coordination unit Sn(IV), while in germanium complex – due to formation of hydrochloride, Ps⋅HCl. |
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