Articles written in Journal of Chemical Sciences
Volume 93 Issue 2 March 1984 pp 117-124 Inorganic and Analytical
An efficient and rapid method of preparation of pheophytin
Volume 93 Issue 4 May 1984 pp 767-783 Inorganic Chemistry
Molecular association of porphyrins and their metal derivatives has been recognized as one of the important properties for many of their biological functions. The association is classified into (i) self-aggregation, (ii) intermolecular association and (iii) intramolecular association. The presence of metal ions in the porphyrin cavity is shown to alter the magnitudes of binding constants and thermodynamic parameters of complexation. The interaction between the porphyrin unit and the acceptor is described in terms of π-π interaction. The manifestation of charge transfer states both in the ground and excited states of these complexes is shown to influence the rates of excited state electron transfer reactions. Owing to paucity of crystal structure data, the time-averaged geometries of many of these complexes have been derived from magnetic resonance data.
Volume 102 Issue 3 June 1990 pp 418-462
Bhaskar G Maiya S M S Chauhan P Bhyrappa V Krishnan P K Bhardwaj Sabyasachi Sarkar Krishna B Pandeya Pavan Mathur Akhil R Chakravarty Birinchi K Das Digambar V Behere Sandeep Modi Samaresh Mitra Sandeep Modi Digambar V Behere Samaresh Mitra Anil Saxena Sandeep Modi Digambar V Behere S Mitra Shyamalava Mazumdar Okhil K Medhi Samaresh Mitra Shyamalava Mazumdar Samaresh Mitra Anup Madan Sandeep Modi Anil Saxena Digamber V Behere S Mitra T Pandiyan M Palaniandavar K L Narayanan H Manohar R Ramaraj C C Thomas S Rajagopal T Rajendra C Srinivasan P Ramamurthy R Roy M C Saha S Panchanan P S Roy C Balagopalakrishna M V Rajasekharan B V Agarwala S Hingorani G A Nagena Gowda Y S Ramaswamy R Halesha N M N Gowda G K N Reddy G C Saxena K L Gupta P Srivastava V D Gupta M Ray R N Mukherjee R N Mohanty K C Dash Ramesh Kapoor S Yadav V Sood P Kapoor B N Anand R Bains Usha K Aggarwal P Garge R Chikate S Padhye J M Savariault P De Loth J P Tuchgues V K Jain M A Vaidya S C Jain S Kalyan Kumar Harkesh B Singh K M Mangaonkar D N Patkar N K Jha Pankaj Sharma S K Date C E Deshpande S D Sathaye S B Deshpande H S Potdar V S Darshane A C Dash R K Nanda N N Das S Gangopadhyay P Banerjee S K Kulshreshtha P S Zacharias N Arulsamy T Ramasami V Subramanian B U Nair M Kanthimathi G Sundararajan V Shivasubramanian R G Bhattacharya S Biswas J Armstrong E M Holt A P Koley
Volume 103 Issue 5 October 1991 pp 685-689 Rapid Communication
Buckminsterfullerene, obtained in good yields at high rates by a suitably designed generator, has been characterized by electron microscopy and in terms of an approximate energy level diagram; C60 undergoes four reversible one-electron reductions giving rise to anionic species and interacts with tetrathiafulvalene to form a charge-transfer complex in the ground state.
Volume 105 Issue 6 October 1993 pp 311-311
Volume 106 Issue 2 April 1994 pp 89-89
Volume 106 Issue 3 June 1994 pp 591-591
Volume 106 Issue 3 June 1994 pp 785-785
Volume 106 Issue 6 November 1994 pp 1259-1259
Volume 107 Issue 4 August 1995 pp 477-486
Synthesis of the free-base
Volume 112 Issue 3 June 2000 pp 171-178
This article presents a brief overview of different kinds of silanols and the important reactions of N-bonded silanetriols. The synthesis and characterization of silanediols containing Si-N and Si-C bonds, (2,4,6-Me3C6H2)N(SiMe3)Si(Me)(OH)2 (1e) is described. 1e shows a polymeric crinkled tape type of structure due to extensive intermolecular hydrogen bonding. We also describe the formation of a neutral copper(II) complex derived from the reaction of CuCl2 with (O)P(3,5-Me2Pz)3 where the ligand undergoes a facile P-N bond cleavage and functions as an N2O type of tridentate ligand.
Volume 112 Issue 3 June 2000 pp 438-438
Volume 116 Issue 2 March 2004 pp 71-78
A series of covalently linked bisporphyrins bearing
Volume 120 Issue 1 January 2008 pp 7-7
Volume 120 Issue 1 January 2008 pp 115-129
Bicovalently linked tetraphenylporphyrins bearing dioxypentane groups at the opposite (transoid, H4A) and adjacent (cisoid, H4B) aryl groups have been synthesised. Protonation of the free-base porphyrins leads to fully protonated species H8A4+/H8A4+ accompanied by expansion of cavity size of the bisporphyrins. The electrochemical redox studies of these porphyrins and their Zinc(II) derivatives revealed that the first ring oxidation proceeds through a two-electron process while the second ring oxidation occurs at two distinct one-electron steps indicating unsymmetrical charge distribution in the oxidized intermediate. The axial ligation properties of the Zinc(Il) derivatives of H4A/H4B with DABCO and PMDA investigated by spectroscopic and single crystal X-ray diffraction studies showed predominant existence of 1 : I complex. The Zn2A.DABCO complex assumes an interesting eclipsed structure wherein DABCO is located inside the cavity between the two porphyrin planes with Zn-N distances at 2.08 and 2.22 Å. The Zn atoms are pulled into the cavity due to coordination towards nitrogen atoms of DABCO and deviate from the mean porphyrin plane by 0.35 Å. The electrochemical redox potentials of the axially ligated metal derivatives are found to be sensitive function of the relative coordinating ability of the ligands and the conformation of the hosts.
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