Novel hexacoordinate organosilicon(IV) complexes of diethylenetriamine Schiff base with SiO2N3 skeleton

Abstract

Some novel hexacoordinate silicon(IV) complexes with a SiO 2 N 3 skeleton were synthesized by using potentially pentadentate ligand N, N'-diethylenetriamine-bis(salicylideneimine). The aforesaid ligand, obtained by the condensation of diethylenetriamine and salicylaldehyde, contains two N of azomethine C=N group, two O of phenolic -OH group and one N of -NHgroup capable of coordination. The ligand reacts with RSiCl 3 (R = CH 3 , C 6 H 5 , C 2 H 5 , CH=CH 2 ) in the presence of triethylamine to yield hexacoordinate silicon complexes 1-4. The resulting complexes were characterized by IR spectroscopy, 1 H, 13 C, 29 Si NMR spectroscopy and elemental analysis. The geometry and hexacoordination was confirmed by comparing the experimental results with computational studies by using GAUSSIAN 03 series of programs. The IR frequencies and 29 Si NMR shifts calculated for isomer B with Density Functional Theory (B3LYP-3-21+G* basis set) correlate with experimental values and suggested the geometry of synthesized complexes. Total energies, dipole moment and bond lengths were calculated from the geometries optimized with semi-empirical methods.

ZnO-Based Imine-Linked Coupled Biocompatible Chemosensor for Nanomolar Detection of Co2+

“…This product was filtered and washed with cold ethanol. The structure elucidation data of 1 matched with the literature report . IR (KBr): v max (in cm –1 ) 1630 (CN), 1459 (CH 2 ); 1 H NMR δ(ppm) 13.29 (bs, 2H, OH), 8.31 (s, 2H, NCH), 7.23 (t, 2H, ArH), 7.18 (d, 2H, ArH), 6.91 (d, 2H, ArH), 6.82 (t, 2H, ArH), 3.67 (m, 4H,NCH2), 2.95 (m, 4H, NCH2); 13 C NMR δ(ppm) 165.9, 161.0,132.2, 131.2, 118.6, 118.4, 116.8, 59.3, 49.5; CHN Analysis; Calcd.…”

“…The structure elucidation data of 1 matched with the literature report. 28 49.4. A small sample of 2 was kept at 500 °C for 2 h to burn the organic receptor coated on the surface of ZnO.…”

Silatranes: a review on their synthesis, structure, reactivity and applications

“…In continuation of our work on hypervalent silicon compounds, 85,86 recently, we have reported the synthesis of 3-isothiocyanatopropylsilatrane ( 133) by reacting aminopropylsilatrane with carbon disulfide and dicyclohexylcarbodiimide 87 (Scheme 8). The use of DCC is found to be better in nonaqueous medium over other reagents (such as heavy-metal salts, dicyandiamide or cyanamide) for the conversion of -NH 2 to -NCS.…”