Modulation of supramolecular chirality by stepwise axial coordination in a nano-size trizinc(ii)porphyrin trimer†‡ † Dedicated to Professor Vadapalli Chandrasekhar on the occasion of his 65th birthday.‡ Electronic supplementary information (ESI) available: Text, figures, and tables depicting detailed experimental procedures and characterisation data including UV-vis, X-ray crystallography and DFT. CCDC 2214044, 2214045, and 1849072. For ESI and crystallographic data in CIF or other electronic format see DOI: https://doi.org/10.1039/d3sc00858d

ABSTRACT: Herein, we report a chiral guest's triggered spring-like contraction and extension motions coupled with unidirectional twisting in a novel flexible and ‘nano-size’ achiral trizinc(ii)porphyrin trimer host upon step-wise formation of 1 : 1, 1 : 2, and 1 : 4 host–guest supramolecular complexes based on the stoichiometry of the diamine guests for the first time. During these processes, porphyrin CD responses have been induced, inverted, and amplified, and reduced, respectively, in a single molecular framework due to the change in the interporphyrin interactions and helicity. Also, the sign of the CD couplets is just the opposite between R and S substrates which suggests that the chirality is dictated solely by the stereographic projection of the chiral center. Interestingly, the long-range el

SUBMITTER: Dhamija A 

PROVIDER: S-EPMC10246700 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature