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Mallick, Abhijit,Oh, Juwon,Majewski, Marcin A.,Stę,pienx301,, Marcin,Kim, Dongho,Rath, Harapriya American Chemical Society etc. 2017 Journal of organic chemistry Vol.82 No.1
<P>Two hitherto unknown core modified hexaphyrin analogues have been synthesized and characterized where the conformational dynamics of these macrocycles in the free base form is achieved by the rotation of thienothiophene units. Further unique property of these macrocycles is the Hiickel-Mobius topological switching. The thermodynamic equilibrium and kinetics of the interconversion leading to Htickel-Mobius switches have been triggered by external stimuli, such as protonation and/or temperature. We have provided a thorough solution-state spectroscopic characterization, solidstate structural evidence combined with in-depth theoretical calculations to investigate the crucial factors involved in such interconversion between Huckel and Mobius topologies for these hexaphyrins which will be useful in designing future new members to expanded porphyrin chemistry.</P>