INDIAN JOURNAL OF CHEMISTRY Section A: Inorganic, Bio-Inorganic, Physical, Theoretical & Analytical Chemistry Editorial Board Prof. A Chakravorty Dept. of Inorganic Chemistry Indian Association for the Cultivation of Science Calcutta 700 032 Prof. S Mitra Chemical Physics Group Tata Institute of Fundamental Research Mumbai 400 005 Prof. D N Satyanarayana Department of Inorganic & Physical Chemistry Indian Institute of Science Bangalore 560 012 Prof. A C Dash Department of Chemistry Utkal University Bhubaneswar 751 004 Prof. R N Goyal Department of Chemistry Roorkee University Roorkee 247 667 Prof. Y K Agrawal Department of Chemistry Gujarat University Ahmedabad 380 009 Prof. S.S.Krishnamurthy Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore 560 012 Prof. Lallan Mishra Department of Chemistry Banaras Hindu University Varanasi 221 005 Dr V K Jain Chemistry Department Bhaba Atomic Research Centre Mumbai 400 085 Prof. N Sathyamurthy Department of Chemistry Indian Institute of Technology Kanpur 208 016 Prof. Pradeep Mathur Department of Chemistry Indian Institute of Technology Mumbai 400 076 Prof. B Viswanathan Department of Chemistry Indian Institute of Technology Chennai 600 036 Dr Anil Kumar Physical Chemistry Division National Chemical Laboratory Pune 411 008 Prof. I Gutman Faculty of Science University of Kragujevac P O Box 60, YU-34000, Kragujevac Yugoslavia Prof. E I Solomon Monroe E Spaght Professor of Chemistry Department of Chemistry Stanford University Stanford, California 94305, U.S.A Prof. Karl Wieghardt Max Planck Institute fur Strahlenchemie Stiftstrasse 34-36 D-45470 Mulheim an der Ruhr Germany Director: V.K. Gupta (Ex-Officio) Editors: Dr S. Sivakamasundari and Dr S.K. Bhasin Assistant Editor: Geeta Mahadevan Technical Officer 'A': Manju Choudhary Phone: 5725990, 5850602, 5786301-7; Fax: 0091-011-5787062; E-mail: ijc_a@niscom.res.in Published by the National Institute of Science Communication, CSIR, Dr K.S. Krishnan Marg, New Delhi 110 012. Copyright, 2002 by the Council of Scientific & Industrial Research, New Delhi 110 001. The Indian Journal of Chemistry is issued monthly in two sections: A and B. Communications regarding contributions for publications in the journal should be addressed to the Editor, Indian Journal of Chemistry, Sec. A, National Institute of Science Communication, Dr K.S. Krishnan Marg, New Delhi 110 012. Phone: 5785359; 5786301-7; Fax: 0091-011- 5787062; E-mail: sales @ niscom.res.in; website: www.niscom.res.in The National Institute of Science Communication (CSIR) assumes no responsibility for the statements and opinions advanced by contributors. The Editorial Board in its work of examining papers received for publication is assisted, in an honorary capacity by a large number of distinguished scientists, working in various parts of India. Annual Subscription: Rs.1000.00 $ 300 Single Copy : Rs.100.00 $ 30.00 15% discount to individual subscribers/institutions/libraries in India only. An additional amount of Rs. 50.00 and US $ 10.00 has to be added for inland outstation and foreign cheques towards service charges. Correspondence regarding subscriptions and advertisements should be addressed to the Sales & Distribution Officer, National Institute of Science Communication, Dr K.S. Krishnan Marg, New Delhi 110 012. Payments in respect of subscriptions and advertisements may be sent by cheque, bank draft, money order or postal order marked payable to NISCOM, New Delhi. Claims for missing numbers of the journal will be allowed only if received within 3 months of the date of issue of the journal plus the time normally required for postal delivery of the journals and the claim. Subscription Complaint No. is 5785359.