Synthesis, Spectral and Biological Studies of Organosilicon(IV) Complexes of Schiff Bases Derived from Amino Acids

Synthesis, Characteristic Spectral Studies and in Vitro Antimicrobial Activity of Organosilicon(IV) Complexes of N-(2-Hydroxynaphthalidene)-Amino Acid Schiff Bases

“…Two sharp bands in the regions 1572-1634 and 509-583 cm −1 are observed and assigned to the ν(C N) azomethine 18,19 and ν(Si ← N) 22,23 frequencies, respectively, indicating the coordination of the ligand to the central silicon atom through the azomethine nitrogen. In the spectra of the complexes two sharp bands are observed at 1629 ± 5 and 1389 ± 19 cm −1 and are assigned to ν as (COO) and ν s (COO) respectively.…”

“…The IR spectra of trimethylsilicon(IV) derivatives show two bands around 1470 ± 10 cm −1 and 1245 ± 13 cm −1 , which have been assigned to the asymmetric and symmetric deformation modes of CH 3 Si respectively. 22,23,38 A strong band at 761 ± 13 cm −1 may be due to ν(Si C) modes. 22,23,38 Whereas the IR spectra of triphenylsilicon(IV) derivatives depict four medium to strong intensity bands at 705, 747 ± 4, 1115 ± 4 and 1468 ± 15 cm −1 , which have been assigned to the ν(Si C 6 H 5 ) modes.…”

“…22,23,38 A strong band at 761 ± 13 cm −1 may be due to ν(Si C) modes. 22,23,38 Whereas the IR spectra of triphenylsilicon(IV) derivatives depict four medium to strong intensity bands at 705, 747 ± 4, 1115 ± 4 and 1468 ± 15 cm −1 , which have been assigned to the ν(Si C 6 H 5 ) modes. 22,23 Due to the steric properties of the bidentate ligands the structure (B) was ruled out, and it was concluded that the three organic (Me or Ph) groups are not in equatorial positions and the two donor atoms viz., oxygen and nitrogen of the ligands, are not in axial positions.…”

“…18,19,22,23 Whereas the infrared spectra of triorganosilicon(IV) derivatives of monosodium salts of Schiff bases derived from 2-hydroxy-1-naphthaldehyde and sodium salts of the amino acides exhibit a band in the 3300-3200 cm −1 region, which could be due to phenolic OH stretching vibrations. This suggests that the phenolic oxygen in R 3 SiHL complexes is not involved in coordination.…”

“…18,19,22 The sharp bands at 830 ± 30 and 635 ± 35 cm −1 in the spectra of the complexes have been assigned to ν as (Si O) and ν s (Si O) respectively. [7][8][9]22,23 Five-coordinate complexes of the type R 3 Si(NO) (where NO = coordinating site of the monoanions of H 2 L 1 to H 2 L 5 ) may assume either of the three trigonal-bipyramidal arrangements (A), (B), and (C) of C s , C 3v and C s symmetry respectively (Figure 4). The IR spectra of trimethylsilicon(IV) derivatives show two bands around 1470 ± 10 cm −1 and 1245 ± 13 cm −1 , which have been assigned to the asymmetric and symmetric deformation modes of CH 3 Si respectively.…”