Induction of supramolecular chirality in di-zinc(II) bisporphyrin via tweezer formation: synthesis, structure and rationalization of chirality.

@article{Brahma2012InductionOS,
  title={Induction of supramolecular chirality in di-zinc(II) bisporphyrin via tweezer formation: synthesis, structure and rationalization of chirality.},
  author={Sanfaori Brahma and Sk Asif Ikbal and Soumyajit Dey and Sankar Prasad Rath},
  journal={Chemical communications},
  year={2012},
  volume={48 34},
  pages={
          4070-2
        }
}
Two new supramolecular complexes consisting of an achiral bisporphyrin host and a chiral diamine guest are reported. One shows a remarkably high amplitude bisignate CD signal while the other one shows a very low value. X-ray structure and other spectroscopic investigations of the tweezer complexes clearly rationalize the origin of the optical activity that has so far remained an unresolved issue. 
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A clear rationalization of the origin of chirality transfer from an optically active diol guest to an achiral Mg(ii)bisporphyrin host in a series of 1 : 2 host-guest supramolecular complexes has been…
Step-wise induction, amplification and inversion of molecular chirality through the coordination of chiral diamines with Zn(II) bisporphyrin.
For the first time, a clear and unambiguous rationalization of chirality induction, inversion and subsequent amplification process has been demonstrated for the 1 : 1 sandwich and 2 : 3 host-guest…
Synthesis and Properties of Bis-Porphyrin Molecular Tweezers: Effects of Spacer Flexibility on Binding and Supramolecular Chirogenesis
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Exciton coupled circular dichroism (ECCD) of complexes with chiral dinitrogen guests provides experimental evidence for the conformational properties of the tweezers, and is supported and rationalized by conformational analysis.
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Metal-coordination-driven mixed ligand binding in supramolecular bisporphyrin tweezers.
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The mixed ligand polymer has been synthesized just by mixing the host and guests in one pot and easily isolated as a solid in nearly quantitative yield due to its high stability.
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Crystallographic characterizations are reported here for both 1:1 sandwich and 1:2 host-guest complexes using the same pair of host and guest, for the first time, which enable us to scrutinize the structural and geometrical changes systematically in rationalizing their optical properties.
Stoichiometrically controlled chirality inversion in zinc bisporphyrinate-monoamine complexes.
TLDR
A novel amide-linked bisporphyrin with a 2-naphthalenecarboxamide substituent on the linker is designed and synthesized for demonstrating that chirality transfer to the host can be tuned by changing the substituents of the linkers.
Induction and Rationalization of Supramolecular Chirality in the Tweezer-Diamine Complexes: Insights from Experimental and DFT Studies.
TLDR
DFT calculations support the experimental observations and have displayed the possible interconversion between clockwise and anticlockwise twisted conformers just upon changing the bulk of the substituent irrespective of the nature of chirality at the stereogenic center.
Complexation of Chiral Zinc(II) Porphyrin Tweezer with Achiral Aliphatic Diamines Revisited: Molecular Dynamics, Electronic CD, and 1H NMR Analysis.
TLDR
The complexation and chiroptical behavior of the host-guest complexes using a new chiral Zn(II) bisporphyrin tweezer host and a series of achiral aliphatic diamine guests varying the chain length is reported.
Complexation of Chiral Zinc-Porphyrin Tweezer with Achiral Diamines: Induction and Two-Step Inversion of Interporphyrin Helicity Monitored by ECD.
TLDR
A new chiral Zn(II) bisporphyrin tweezer is reported in which two achiralZn( II) porphyrin moieties are covalently linked by (1R,2R)-diphenylethylenediamine, which produces a strong chiral field around the porphyrsine moieties, leading to two-step inversion of chirality.
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TLDR
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TLDR
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TLDR
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TLDR
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