CONTENTS

Zinc phthalocyanine-nicotinamide complexes: evidence of their formation by using spectral studies Roberta Del Sole*, M. Rosaria Lazzoi, Agnese De Luca and Giuseppe Vasapollo* DOI: 10.1142/S1088424607000898 Page: 773-783 Spectral studies which provide evidence of complexes formation of zinc phthalocyanines or zinc naphthalocyanines and nicotinamide (NAM) or its positional isomers, known as isonicotinamide (iNAM) and picolinamide (PAM), are reported. FT IR and NMR spectroscopic studies as well as job plot analyses in chloroform have been performed. To validate complexes formation some of them have been also isolated, fully characterized and their binding properties and thermal stability have been also investigated.
Synthesis of meso-thienyl- and meso-furyl N2S3 sapphyrins and N2S4 rubyrins Smita Rai and Ravikanth Mangalampalli* DOI: 10.1142/S1088424607000904 Page: 784-794 Sapphyrins and rubyrins with N2S3 and N2S4 cores respectively containing thienyl and furyl groups at meso-positions were synthesized and spectral properties were compared with their corresponding meso-tolyl analogues.
Influence of steric hindrance on the solvent-dependent absorption spectral behavior of highly brominated free base porphyrin and its Zn(II) complex Puttaiah Bhyrappa*, Chellaiah Arunkumar and Babu Varghese DOI: 10.1142/S1088424607000916 Page: 795-804 To examine the effect of steric hindrance on the solvent dependent absorption spectra, the highly brominated nonplanar porphyrin, H2T(3’,5’-DMP)PBr16 and its Zn(II) complex were studied in various solvents. These derivatives showed decreased red-shift of the absorption bands relative to their corresponding MTPPBr8 derivatives. This has been ascribed to the enhanced steric hindrance than the electron deficiency of the porphyrin π-system as evidenced from the crystal structure of the H2T(3’,5’-DMP)PBr16·6(C2H4Cl2).
A study on the self assembly of Fe(II) and dual binding of Ni(II) porphyrazines on CT-DNA Elham Safaei*, Bijan Ranjbar and Leila Hasani DOI: 10.1142/S1088424607000928 Page: 805-814 The binding process of [Ni(tmtppa)]4+ and [Fe(tmtppa)]4+ to calf thymus DNA (CT-DNA) has been investigated. In this way binding constants, thermodynamic parameters and binding modes have been determined.
Structure, aromaticity, and bonding in subporphyrins: theoretical study of [14]tribenzosubporphine(1.1.1)hydroxyboron(III) and [14]subporphine(1.1.1)hydroxyboron(III) complexes Pablo Campomanes, María I. Menéndez and Tomás L. Sordo* DOI: 10.1142/S108842460700093X Page: 815-821 A theoretical analysis of the structure, aromaticity, magnetic properties and bonding in the title complexes was performed. In these cone-shaped molecules the 14-π electron current induced by an external magnetic field does not follow a [14]-annulene path but the inner edge of the macrocycle. The involvement of the N atoms in the 14-π aromatic core implies that one of the B-N bonds is a dative one causing through resonance a long average B-N bond length.
Synthesis of some β-nitro-meso-tetraphenylporphyrin derivatives Przemysław Wyrębek and Stanisław Ostrowski* DOI: 10.1142/S1088424607000941 Page: 822-828 Reactions of meso-tetraarylporphyrin copper(II) complexes, carried out in CHCl3 at room temperature with aqueous HNO3, resulted in the formation of the respective mono-β-nitrated products, in good or very good yield (74%-93%). All the synthesized compounds were demetallated in CF3CO2H/H2SO4 mixture to give β-nitro-substituted porphyrin free bases.

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