Complexes of rhodium(III) with N-functionalized calix[4]resorcinolol

Synthesis, Characterization and Antibacterial Activityof Schiff Bases Derived from 4-Dimethylaminobenzaldehyde with Some Amino Acids and 4-Aminoantipyrine toward Cu (II), Ni (II), Co (II), Cd (II) and Mn (II) Ions

“…The electronic spectra of the Mn(II)-L 3 complex shows absorption bands at 295nm, 380nm (9833-12667 cm -1 ) which is a feature of octahedral geometry that correspond to 6 A 1 g→ 4 T 2 g (G), 6 A 1 g → 4 E 1 g, 4 A 1 g (G) transitions [17]. [19]. At the same time, the --NH 2 , group vanishes with the formation of L 5 which indicates the presence of azomethine group at 9.416 ppm.…”

Influence of Solvents on Protolytic and Aggregation Properties of Aminomethylated Calix[4]resorcine

“…Previous research of calix [4]resorcine L1 has shown [12] that in the studied solvents a molecule in a wide range of рН = 5-10 has close to zwitterion structure in which a hydrogen ion is collectivized by nitrogen and oxygen atoms. Maximum protonation of nitrogen atoms is an energetically favorable process.…”

“…[1,2] They are of interest as new types of catalysts, [3][4][5][6] selective sorbents of molecules and ions, [7,8] sensors, [9] bioregulators. [10] Earlier [11][12][13] we have described the complexing properties of aminomethylated calix [4] Depending on the solvent used (ethanol or acetone), the complexes of different composition and structure were isolated in the solid phase; but in some cases [11][12][13] complexing was not observed. We believe that this is due to the formation of associates of different -depending on the solventcompositions and structures, as a result of which the donor centers of the molecules -ligands are disabled.…”