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dc.contributor.authorSenge, Mathias
dc.date.accessioned2021-02-25T16:38:52Z
dc.date.available2021-02-25T16:38:52Z
dc.date.issued2020
dc.date.submitted2020en
dc.identifier.citationKingsbury, C.J., Flanagan, K.J., Eckhardt, H.G., Kielmann, M., Senge, M.O., Weak Interactions and Conformational Changes in Core-Protonated A2- and Ax-Type Porphyrin Dications. Molecules. 2020 Jul 13; 25(14):3195en
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/95402
dc.description.abstractIndividual chemical motifs are known to introduce structural distortions to the porphyrin macrocycle, be it in the core or at the periphery of the macrocycle. The interplay when introducing two or more of these known structural motifs has been scarcely explored and is not necessarily simply additive; these structural distortions have a chance to compound or negate to introduce new structural types. To this end, a series of compounds with complementary peripheral (5,15-disubstitution) and core (acidification) substitution patterns were investigated. The single-crystal X-ray structures of 18 5,15-diphenylporphyrin, 5,15-diphenylporphyrindi-ium diacid, and related compounds are reported, including the first example of a 5,15-dialkylporphyrindi-ium. Normal-coordinate structural decomposition (NSD) analysis is used for a detailed analysis of the conformation of the porphyrin subunit within the crystal structures. An elongation of porphyrin macrocycles along the C5,C15- axis (B2g symmetry) is observed in all of the free base porphyrins and porphyrin dications; distance across the core is around 0.3 Å in the free base and diacid compounds, and more than doubled in 5,15-dipentylporphyrin and 5,15-dipentylporphyrindi-ium diacid. While the free base porphyrins are largely planar, a large out-of-plane distortion can be observed in 5,15-diphenylporphyrin diacids, with the expected "projective saddle" shape characteristic for such systems. The combination of these two distortions (B2u and B2g) from regular porphyrin structure results in a macrocycle best characterized in the chiral point-group D2. A rare structural type of a cis-hydrogen bond chelate is observed for 5,15-dipentylporphyrindi-ium diacid, which adopts an achiral C2v symmetry. Crystallographic data indicate that the protonated porphyrin core forms hydrogen bonding chelates (N-H⋯X⋯H-N) to counter-anions. Weaker interactions, such as induced intramolecular C-H⋯O interactions from the porphyrin periphery are described, with distances characteristic of charge-assisted interactions. This paper offers a conceptual framework for accessing porphyrin macrocycles with designable distortion and symmetry, useful for the selective perturbation of electronic states and a design-for-application approach to solid state porphyrin materials.en
dc.language.isoenen
dc.relation.ispartofseriesMolecules;
dc.relation.ispartofseries25;
dc.relation.ispartofseries14;
dc.rightsYen
dc.subjectConformational analysisen
dc.subjectCrystallographyen
dc.subjectNonplanar macrocyclesen
dc.subjectPorphyrinsen
dc.subjectWeak interactionsen
dc.titleWeak Interactions and Conformational Changes in Core-Protonated A 2- and A x-Type Porphyrin Dicationsen
dc.typeJournal Articleen
dc.contributor.sponsorScience Foundation Irelanden
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/sengem
dc.identifier.rssinternalid224217
dc.identifier.doihttp://dx.doi.org/10.3390/molecules25143195
dc.rights.ecaccessrightsopenAccess
dc.contributor.sponsorGrantNumberIvP 13/IA/1894en


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