The attainment of a better understanding of the dependence of photoinduced electron transfer reaction rates on the molecular structures of the donor and acceptor entities results in improving the capture and storage of solar energy. Here, the intermolecular and supramolecular electron transfer processes from electron donors (porphyrins (P), chlorophylls (Chl), phthalocyanines (Pc) and naphthalocyanines (Nc)) and their metal derivatives to electron acceptors (fullerenes such as C 60 and C 70 ) studied by nanosecond and picosecond laser flash photolysis techniques in polar and nonpolar solvents are reviewed. For intermolecular systems in polar solvents, photoinduced electron transfer takes place via the excited triplet states of C 60 /C 70 or via the excited triplet states of P/Pc/Nc, yielding solvated radical ions in polar solvents; thus, the back electron transfer rates are generally slow. In the case of the supramolecular dyads and triads formed by axial coordination, hydrogen bonding, crown ether complexation, or rotaxane formation, the photoinduced charge separation takes place mainly from the excited singlet state of the donor; however, the back electron transfer rates are generally quite fast. The relations between structures and photochemical reactivities of these novel supramolecular systems are discussed in relation to the efficiency of charge separation and charge recombination.

Intermolecular and supramolecular photoinduced electron transfer processes of fullerene–porphyrin/phthalocyanine systems

Synthesis and characterisation of tin(IV) and organotin(IV) derivatives 2-{[(2-hydroxyphenyl)imino]methyl}phenol

An investigation of chloride-substituted Schiff bases as corrosion inhibitors for steel

The in vitro antibacterial and antifungal activities of five different amino acid Schiff bases derived from the reaction of 2-hydroxy-1-naphthaldehyde with glycine, L-alanine L-phenylalanine, L-histidine, L-tryptophane and the manganese(III) complexes of these bases were investigated. Structures of the Schiff bases were proven by 1H-NMR. In vitro activities against some Gram-positive (Staphylococcus aureus and Bacillus polymyxa) and Gram-negative (Escherichia coli) bacteria and the fungus Candida albicans were determined. The antimicrobial activities tended to decrease with the increasing size of the amino acid residues.

Antimicrobial activities of N-(2-hydroxy-1-naphthalidene)-amino acid(glycine, alanine, phenylalanine, histidine, tryptophane) Schiff bases and their manganese(III) complexes.

Two new hexadentate N2O4 donor Schiff bases, H4L1 and H4L2, were synthesized by condensation of 4,6-diacetylresorcinol with glycine and alanine, respectively. The structures of the ligands were elucidated by elemental analyses, IR, 1H NMR, electronic, and mass spectra. Reactions of the Schiff bases with copper(II), nickel(II), and iron(III) nitrates in 1 : 2 molar ratio gave binuclear metal complexes and, in the presence of 8-hydroxyquinoline (8-HQ) or 1,10-phenanthroline (Phen) as secondary ligands (L′), mixed-ligand complexes in two molar ratios 1 : 2 : 2 and 1 : 2 : 1 (L1/L2 : M : L′). The complexes were characterized by elemental and thermal analyses, IR, electronic, mass, and ESR spectral studies, as well as conductivity and magnetic susceptibility measurements. The spectroscopic data reveal that the Schiff-base ligands were dibasic or tetrabasic hexadentate ligands. The coordination sites with the metal ions are two azomethine nitrogens, two oxygens of phenolic groups, and two oxygens of carboxylic ...

Synthesis, spectral studies, and antimicrobial activity of binary and ternary Cu(II), Ni(II), and Fe(III) complexes of new hexadentate Schiff bases derived from 4,6-diacetylresorcinol and amino acids

New complexes of Mn(III) with Schiff bases obtained by the condensation of 2-hydroxy-1-naphthaldehyde with glycine, L-alanine, L-phenylalanine, L-histidine, L-tryptophan and L-threonine have been synthesized and characterized by elemental analyses, UV, IR, magnetic susceptibility, thermogravimetry and non-aqueous titration. These complexes are coordinated through the ONO donor set derived from the carboxyl, imino and phenoxy groups of the ligands. Furthermore, the Schiff bases were obtained as solids and their structures were determined by IR, UV, 1H NMR to compare with those of the complexes.

Synthesis and characterization of manganese(iii) complexes of schiff bases derived from amino acids and 2-hydroxy-1-naphthaldehyde

A new method is reported for the synthesis of manganese(III) acetate dihydrate from manganese(II) acetate tetrahydrate, lead(IV) oxide and acetic acid as solvent. Melting point, mixed melting point with manganese(III) acetate dihydrate obtained by the well–known Christiensen method, elemental analyses, and potentiometric titration with a standard hydroquinone solution in acetic acid showed that the compound obtained by the new method was very pure (99.6%). In addition a solution of the compound in acetic acid was used to titrate potentiometrically some hydrazine derivatives and excellent results were obtained.

A New Method for Synthesis of Manganese(III) Acetate Dihydrate

The reactions of geminal N3P3Ph2Cl4 and N3P3(NHBut)2Cl4 with difunctional reagents have been investigated. The N.M.R. spectra of the derivatives are reported. The basicity of these products in nitrobenzene solution is reported and the basicity substituent constants evaluated. X-ray crystallographic data are presented.

THE REACTIONS OF GEMINAL N3P3Ph2Cl4 AND N3P3(NHBut)2Cl4 WITH DIFUNCTIONAL REAGENTS. X-RAY CRYSTALLOGRAPHY, NMR SPECTROSCOPY AND BASICITY OF THE PRODUCTS

Titrations in non-aqueous media: potentiometric investigation of symmetrical and unsymmetrical tetra-aryl porphyrins with 4-nitrophenyl and 4-aminophenyl substituents in nitrobenzene solvent.

The potentially heptadentate ligand trensal, 2.2′2″-tris(salicylideneimino)triethylamine, has been investigated by n.m.r. spectroscopy and X-ray crystallography. The 1H and 13C n.m.r. spectra of this compound have been completely assigned. The single crystal X-ray investigation, R=0.073, showed the compound to be monoclinic, space group P21/c, a=9.857(2), b=11.208(2), c= 22.910(4)A, β=98.81(1)°. Strong intramolecular hydrogen bonding occurs between the hydroxy hydrogen atoms and the azomethine nitrogen atoms. The compound exhibits an approximate three-fold axis when looking down the unique nitrogen atom through the plane C(11)–C(21)–C(31).

X-Ray crystallographic, 1H, and 13C nuclear magnetic resonance investigation of the potentially heptadentate ligand trensal, 2,2′,2″-tris(salicylideneimino)triethylamine

Turgut Gündüz

Papers

Synthesis and characterization of manganese(iii) complexes of schiff bases derived from amino acids and 2-hydroxy-1-naphthaldehyde

A New Method for Synthesis of Manganese(III) Acetate Dihydrate

THE REACTIONS OF GEMINAL N3P3Ph2Cl4 AND N3P3(NHBut)2Cl4 WITH DIFUNCTIONAL REAGENTS. X-RAY CRYSTALLOGRAPHY, NMR SPECTROSCOPY AND BASICITY OF THE PRODUCTS

Titrations in non-aqueous media: potentiometric investigation of symmetrical and unsymmetrical tetra-aryl porphyrins with 4-nitrophenyl and 4-aminophenyl substituents in nitrobenzene solvent.

X-Ray crystallographic, 1H, and 13C nuclear magnetic resonance investigation of the potentially heptadentate ligand trensal, 2,2′,2″-tris(salicylideneimino)triethylamine