Journal ArticleHelicene‐Bis‐Porphyrin Conjugates: Exciton Coupling Chirality and Chiral‐Induced Spin SelectivityMatozzo, Paola [Institut des Sciences Chimiques de Rennes CNRS UMR 6226 ISCR University of Rennes F‐35000 Rennes France]; Santra, Kakali [Department of Chemical and Biological Physics Weizmann Institute of Science Rehovot 76100 Israel] (ORCID:0000000162523323); Kumar, Anil [Department of Chemical and Biological Physics Weizmann Institute of Science Rehovot 76100 Israel]; Parmar, Saurav [Department of Chemistry University at Buffalo State University of New York Buffalo New York 14260 USA] (ORCID:0009000824427064); Morgante, Pierpaolo [Department of Chemistry University at Buffalo State University of New York Buffalo New York 14260 USA] (ORCID:0000000275222535); Dhbaibi, Kais [Institut des Sciences Chimiques de Rennes CNRS UMR 6226 ISCR University of Rennes F‐35000 Rennes France] (ORCID:0000000178306913); Rajendran, Rajatha [Institut des Sciences Chimiques de Rennes CNRS UMR 6226 ISCR University of Rennes F‐35000 Rennes France]; Vanthuyne, Nicolas [CNRS Centrale Med FSCM Aix Marseille Univ 13397 Marseille France] (ORCID:0000000325987940); Naaman, Ron [Department of Chemical and Biological Physics Weizmann Institute of Science Rehovot 76100 Israel] (ORCID:000000031910366X); Autschbach, Jochen [Department of Chemistry University at Buffalo State University of New York Buffalo New York 14260 USA] (ORCID:000000019392877X); Crassous, Jeanne [Institut des Sciences Chimiques de Rennes CNRS UMR 6226 ISCR University of Rennes F‐35000 Rennes France] (ORCID:0000000240376067)<p>Following previous work on helicene–porphyrin conjugates in which carbo[6]helicene are connected to zinc‐porphyrin via phenyl‐bis‐ethynyl bridges (<bold>Por(Zn)‐H[6]</bold>^{<bold>1</bold>}, series 1), and displaying clear exciton coupling (EC) chirality, novel carbo[6]helicenes derivatives substituted at their 2,15 positions by zinc‐porphyrin units are prepared, either through a triple bond (<bold>Por(Zn)‐H[6]</bold>^{<bold>2</bold>}, series 2), or through an alkynyl‐phenyl bridge (<bold>Por(Zn)‐H[6]</bold>^{<bold>3</bold>}, series 3). Series 2 is also synthesized with free porphyrins or different metals [Ni(II) and Pd(II)]. Their photophysical and chiroptical properties (electronic circular dichroism and circularly polarized luminescence) are characterized, and it is examined how i) the distance between the porphyrin units and ii) the metal type impacted these properties. Experimental and theoretical analyses highlight strong responses originating from EC chirality in combination with the typical helicene‐centered optical activity. The<bold>Por(Zn)‐H[6]</bold>^{<bold>2</bold>}system displaying strong absorption dissymmetry factors is then selected to experimentally examine the chiral‐induced spin selectivity effect by magnetic conductive atomic force microscopy; a spin polarization of 50% is measured.</p>Wiley2026-01-0110664095ChemistryEurope412751-4765https://doi.org/10.1002/ceur.2025003142503332National Science Foundation