biostudies-literatureSrinivasan AEuropean Synchrotron Radiation FacilityUniversité de BordeauxAgence Nationale de la RechercheCentre National de la Recherche ScientifiqueH2020 Marie Skłodowska-Curie Actions1136-1143https://www.ebi.ac.uk/biostudies/studies/S-EPMC5884025biostudies-literatureUnknown9(5)A simple procedure based on anion exchange was employed for the enantiomeric resolution of the extended metal atom chain (EMAC) [Co3(dpa)4(MeCN)2]2+. Use of the chiral salt (NBu4)2[As2(tartrate)2], (Λ-1 or Δ-1), resulted in the selective crystallization of the EMAC enantiomers as [Δ-Co3(dpa)4(MeCN)2](NBu4)2[Λ-As2(tartarte)2]2, (Δ-2) and [Λ-Co3(dpa)4(MeCN)2](NBu4)2[Δ-As2(tartrate)2]2 (Λ-2), respectively, in the P4212 space group, whereas a racemic mixture of 1 yielded [Co3(dpa)4(MeCN)2][As2(tartrate)2]·2MeCN (rac-3), which crystallized in the C2/c space group. The local electronic and magnetic structure of the EMAC enantiomers was studied, exploiting a variety of dichroisms in single crystals. A strong linear dichroism at the Co K-edge was observed in the orthoaxial configuration, whereas iChemical scienceEnantiomeric resolution and X-ray optical activity of a tricobalt extended metal atom chain.PMC5884025ANR-11-JS07-013-01706556CH-4457CH-5009CH-4171Cortijo MRogalev ASainctavit PRosa PBulicanu VWilhelm FClerac RHillard EANaim ASrinivasan AfalseEnantiomeric resolution and X-ray optical activity of a tricobalt extended metal atom chain.A simple procedure based on anion exchange was employed for the enantiomeric resolution of the extended metal atom chain (EMAC) [Co3(dpa)4(MeCN)2]2+. Use of the chiral salt (NBu4)2[As2(tartrate)2], (Λ-1 or Δ-1), resulted in the selective crystallization of the EMAC enantiomers as [Δ-Co3(dpa)4(MeCN)2](NBu4)2[Λ-As2(tartarte)2]2, (Δ-2) and [Λ-Co3(dpa)4(MeCN)2](NBu4)2[Δ-As2(tartrate)2]2 (Λ-2), respectively, in the P4212 space group, whereas a racemic mixture of 1 yielded [Co3(dpa)4(MeCN)2][As2(tartrate)2]·2MeCN (rac-3), which crystallized in the C2/c space group. The local electronic and magnetic structure of the EMAC enantiomers was studied, exploiting a variety of dichroisms in single crystals. A strong linear dichroism at the Co K-edge was observed in the orthoaxial configuration, whereas i2018-01-01T00:00:00Z2018 Feb2025-04-04T19:34:21.589Z2019-03-26T23:29:12ZS-EPMC58840252967515810.1039/c7sc04131d