Structural and spectral studies of N-(3-hydroxypyridine-2-yl)-5-hydroxysalicylideneimine and its dimethyltin(IV) complex

State of the Art of Boron and Tin Complexes in Second- and Third-Order Nonlinear Optics §

Boron and tin complexes have been a versatile and very interesting scaffold for the design of nonlinear optical (NLO) chromophores. In this paper we present a wide range of reports since the 1990s to date, which include second-order (e.g., second harmonic generation) and third-order (e.g., two-photon absorption) NLO properties. After a short introduction on the origin of the NLO response in molecules, the different features associated with the introduction of these inorganic motifs in the organic-based NLO materials are discussed: Their effect on the accepting/donating capabilities of the substituents, on the efficiency of the π-conjugated linkage, and on the topology of the chromophores which can be tuned from the first generation of “push-pull” chromophores to more sophisticated two- or three-dimensional architectures.

Theoretical studies of organotin(IV) complexes derived from ONO-donor type schiff base ligands

In this work a molecular modeling study was carried out based on a series of organotin(IV) derivatives which were complexed with ONO-Donor type Schiff base ligands to build up a statistical data pool for researchers. For this purpose, various properties of the selected complexes such as energies, band gaps, chemical reactivity descriptors, polarizabilities, geometric parameters, (1)H-NMR, (13)C-NMR chemical shifting values were obtained through density functional theory using B3LYP, CAM-B3LYP, TPSSTPSS, TPSSh, HCTH, wB97XD, and MN12SX functionals. Empirical dispersion corrections were incorporated for some functionals and solvent effects were also taken into account through applying polarizable continuum model (PCM). (1)H-NMR, (13)C-NMR chemical shifts were calculated via linear regression analysis using either gauge invariant atomic orbital (GIAO) or continuous set of gauge transformations (CSGT) methods. While structural properties were being explored, quantitative effects of utilized functionals and empirical dispersion corrections over calculated properties were shown in detail.

Synthesis, characterization, biological activities of dimethyltin(IV) complexes of Schiff bases with ONO-type donors

Four different dimethyltin(IV) complexes of Schiff bases derived from 2-amino-3-hydroxypyridine and different substituted salicylaldehydes have been synthesized. The compounds, with the general formula [Me(2)Sn(2-OArCH=NC(5)H(3)NO)], where Ar=-C(6)H(3)(5-CH(3)) [Me(2)SnL(1)], -C(6)H(3)(5-NO(2)) [Me(2)SnL(2)], -C(6)H(2)(3,5-Cl(2)) [Me(2)SnL(3)], and -C(6)H(2)(3,5-I(2)) [Me(2)SnL(4)], were characterized by IR, NMR ((1)H and (13)C), mass spectroscopy and elemental analysis. Me(2)SnL(3) was also characterized by X-ray diffraction analysis and shows a fivefold C(2)NO(2) coordination with distorted square pyramidal geometry. H(3)C-Sn-CH(3) angles in the complexes were calculated using Lockhart's equations with the (1)J((117/119)Sn-(13)C) and (2)J((117/119)Sn-(1)H) values (from the (1)H-NMR and (13)C-NMR spectra). The in vitro antibacterial and antifungal activities of dimethyltin(IV) complexes were also investigated.