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The compounds were fully characterized by NMR, FTIR, mass spectrometry, electrochemistry, and steady\u2010state absorption spectroscopy. Femtosecond transient absorption (fs\u2010TAS) measurements revealed rapid internal conversion from the S\n                    <jats:sub>2<\/jats:sub>\n                    state to a stabilized intramolecular charge\u2010transfer (ICT) state within picoseconds, followed by slower recovery to the ground state. Global kinetic analysis confirmed that ICT lifetimes are strongly modulated by the nature of the acceptor moiety. ICT\u2010driven delocalization can have a significant effect in enhancing NLO activity. Open\u2010aperture Z\u2010Scan experiments at 800 and 1060 nm demonstrated pronounced reverse saturable absorption arising from two\u2010photon absorption (TPA). Among the series, the 3\u2010bromophenyl derivative exhibited the highest TPA coefficient (\u03b2 \u223c10\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>5<\/jats:sup>\n                    cm\/GW), attributed to enhanced ICT stabilization and extended \u03c0\u2010conjugation. These results highlight halogen substitution as a critical design principle, with bromine enhancing electronic polarization and amplifying NLO performance. The combined spectroscopic and optical studies establish ferrocene\u2013chalcone hybrids as versatile molecular platforms for rational design of photonic materials, offering valuable guidelines for optical limiting and optoelectronic applications.\n                  <\/jats:p>","DOI":"10.1002\/asia.70809","type":"journal-article","created":{"date-parts":[[2026,6,2]],"date-time":"2026-06-02T03:56:48Z","timestamp":1780372608000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Ultrafast Excited State Dynamics and Nonlinear Optical Properties of Ferrocene\u2010Functionalized Chalcone Derivatives"],"prefix":"10.1002","volume":"21","author":[{"given":"Sunil Kumar","family":"Patel","sequence":"first","affiliation":[{"name":"School of Chemical and Materials Sciences Indian Institute of Technology Goa  Farmagudi Ponda Goa India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shriya","family":"Saha","sequence":"additional","affiliation":[{"name":"School of Chemical and Materials Sciences Indian Institute of Technology Goa  Farmagudi Ponda Goa India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3317-3800","authenticated-orcid":false,"given":"Raja","family":"Mitra","sequence":"additional","affiliation":[{"name":"School of Chemical and Materials Sciences Indian Institute of Technology Goa  Farmagudi Ponda Goa India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E. 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