JOURNAL OF NONLINEAR SCIENCES AND APPLICATIONS

In this paper, we prove the weak and strong convergence of an explicit iterative process to a common fixed point of an asymptotically quasi-I-nonexpansive mapping T and an asymptotically quasi-nonexpansive mapping I, defined on a nonempty closed convex subset of a Banach space

Synthesis and antimicrobial activity of new schiff bases having the -SiOR group (R = CH (3) or CH2CH3), and their transition metal complexes

WOS: 000232626900019Two new Schiff base ligands containing -SiOCH3 or -SiOCH2CH3 groups, 4-{[(3-trimethoxysilanepropyl)imino] methyl} benzene-1,3-diol (1) Hmsb and 4-{[(3-triethoxysilanepropyl)imino]methyl} benzene-1,3-diol (5) Hesb, have been synthesized by the reaction of 2,4- dihydroxybenzaldehyde with 3-aminopropyltrimethoxysilane and 3-aminopropyltriethoxysilane. Six new transition metal [Cu-II, Ni-II and Co-II] complexes of these Schiff Base ligands were prepared. The complexes are formed by coordination of N, O atoms of the ligands. Their structures were confirmed by elemental analyses, H-1 nmr, i.r. and u.v.-vis. spectral data. The analytical data shows that the metal-to-ligand ratio in the Schiff Base complexes contains silane in 1:2. In addition, the antimicrobial activity of (1) Hmsb and (5) Hesb Schiff ligands, and their [M(msb)(2)] and [M(esb)(2)] type coordination compounds, were investigated

Bis{μ-ethyl 4-[(4-hydroxyphenyl)diazenyl]benzoate-κO}bis[aqua(4-{[4-(ethoxycarbonyl)phenyl]diazenyl}phenolato-κO){ethyl 4-[(4-hydroxyphenyl)diazenyl]benzoate-κO}potassium]

The two potassium cations in the dinuclear molecule of [K2{OC(C14H13ON2)O}2{OC(C14H13ON2)OH}4(H2O)2] are connected through a double bridge involving two centrosymmetrically related ethyl-4-(phenylazophenol)benzoate ligands. Each cation is also bound to a further non-bridging ligand, one ethyl-4-(phenylazophenolate)benzoate anion and a water molecule, leading to a distorted fivefold coordination. The two uncharged ligands are almost planar, whereas in the anionic ligand the aromatic systems display a dihedral angle of 21.14 (11)°. A supramolecular network formed by hydrogen-bonding interactions between phenolate anions, phenol groups and water molecules connects the dimeric species along [001]. Hirshfeld surface calculations revealed the following contributions related to intermolecular interactions: C...H (24.4%), O...H (13.2%) and N...H (7.4%). The azo fragment is disordered over two sets of sites [occupancy ratio 0.824 (15):0.176 (5)]