The ferrocenyl chalcone compounds C5H5FeC5H4CO (CH = CH)nC6H3 (n = 1, 2, 3, 4) and C5H5FeC5H4 (CH = CH)nCOC6H5 (n = 0, 1, 2) were synthesized to study the forked conjugate systems; one branch acts as the substituent while the other as the terminal group. The Moessbauer effect was used to probe changes in the electronic environment at the iron nucleus. The homologous factor (1/a)2N is used to demonstrate that the quadrupole splitting and isomer shift well conform to the rule of homologous linearity.

Key words: SUBSTITUENT EFFECT, CHALCONE, FERROCENE, FORKED CONJUGATIVE SYSTEM, MOSSBAUER SPECTROSCOPY