00456nam a2200121 a 450000500170000008200170001710000140003411000220004824501360007026000690020630000140027565300450028920251203115514.0  a547.593bbal  aBalaji R.  aDr. Venkatesan. R  aSemi- empirical Calculations on structural and electronic properties of B substituted fluoro chloro and bromo tetraphenylporphyrins  aPondicherybDept. of Chemistry, Pondicherry UniversitycNov-2004  a44pc32cm  aChemistry: tetraphenylporphyrins, M.Phil