Abstract
Directing excited-state behavior of photoactive molecules without covalent modification has been more frequently achieved through inclusion within cavitands than by any other supramolecular approach. Such efforts have led to interesting photophysicochemical phenomena and their applications. This includes employing strategies such as use of chromo-/luminophore-cavitand interactions to perturb the electronic states to affect quantum efficiencies of radiative processes or structural pre-orientation of reactants to achieve chemoselectivity. The influence of nano-containers such as macrocyclic cavitands, nanocages, and capsules on the photoactive molecules has been observed in solution phase as well as the solid state, which has been studied through spectroscopy, product selectivity analysis, and computational chemistry. This chapter will highlight prominent works in the past two decades that studied the nano-container-photoactive guest systems whose significance extends well beyond the domain of supramolecular photochemistry. The crucial nature of such works in gaining new insight into electronic, bonding, and dynamics nature of chemical interactions or their role in realizing new applications is discussed herein. The contents are organized on the basis of named photochemical reactions or photophysical activity affected through nano-container mediation contrasted with that of the free chromophore or luminophore. Three cavitands (families) cyclodextrins, cucurbiturils, and octa acids are primarily focused due to their literature predominance leading to a comprehensive understanding of their effects, with relatively less frequent instances of calixarenes and crown-ethers. Differences in physicochemical influences affected by the various cavitand families as well as that within the oligomers of a given family will be discussed wherever possible, and diversity in such effects is analyzed on the basis of “supramolecular cause-and-effect” relationship.
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Abbreviations
- α-CD:
-
α-cyclodextrin
- β-CD:
-
β-cyclodextrin
- γ-CD:
-
γ-cyclodextrin
- λfl:
-
Fluorescence wavelength
- τF:
-
Fluorescence lifetime
- Φ:
-
Quantum yield
- ΦF:
-
Fluorescence quantum yield
- ACN:
-
Acenaphthylene
- ADT:
-
Adamantathione
- ANT:
-
Anthracene
- aPS:
-
Activatable photosensitizers
- BP:
-
Biphenyl bipyridinium guest
- CA:
-
Cinnamic acid
- CB:
-
Cucurbituril
- CB7:
-
Cucurbit[7]uril
- CB8:
-
Cucurbit[8]uril
- CD:
-
Cyclodextrin
- CE:
-
Crystal engineering
- CHT:
-
Camphorthione
- Coum-n:
-
Coumarins
- D-A:
-
Donor-acceptor
- DBA:
-
Dibenzal acetone
- DMABN:
-
N,N-Dimethylaminobenzonitrile
- DNC:
-
Dinaphthyl crown ether
- E*:
-
Excimer
- FNT:
-
Fenchthione
- HH:
-
Head-to-head
- HOMO:
-
Highest occupied molecular orbital
- HT:
-
Head-to-tail
- IC:
-
Internal conversion
- ISC:
-
Intersystem crossing
- ITC:
-
Intramolecular charge transfer
- L:
-
Linker
- LE:
-
Local excited state
- LUMO:
-
Lowest unoccupied molecular orbital
- M*:
-
Excited-state monomer
- MM:
-
Molecular mechanics
- MO:
-
Molecular orbital
- NBS:
-
N-benzyl succinimide
- NpE:
-
Naphthyl benzoates
- NPM:
-
N-phenylmaleimide
- OA:
-
Octa acid
- OAm:
-
Octa amine
- P*:
-
Excited-state product
- PAH:
-
Polyaromatic hydrocarbon
- PCA:
-
Photocycloaddition
- Pd-NC:
-
Palladium nanocage
- PDT:
-
Photodynamic therapy
- Py:
-
Pyrene
- R*:
-
Excited-state reactant
- RH:
-
Rebek’s host
- RTP:
-
Room temperature phosphoroscence
- SOG:
-
Singlet oxygen generator
- SQ:
-
Squaraines
- STB:
-
4,4′-dimethyl stilbene
- ST-n:
-
Stilbazole guests
- TB-B:
-
Biotinylated toluidine blue
- TF:
-
Thioflavin
- TICT:
-
Twisted intramolecular charge transfer
- TP+:
-
2,4,6-triphenylpyrylium
- TPOR:
-
Tetranaphthyl-substituted porphyrin
- VSEPR:
-
Valence shell electron pair repulsion
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AN thanks GE Additive to support and approve the publication content. MP would like to thank his professional and life partner, Dr. Surabhi Chandra, for her support and patience during the preparation of this chapter. He also expresses his gratitude to Dr. Richard Mocarski (Assistant Vice Chancellor for Research) for his passionate support for research and providing new opportunities for researchers at UNK.
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Pattabiraman, M., Natarajan, A. (2020). Photophysicochemical Processes Directed Within Nano-Containers. In: Martínez-Martínez, V., López Arbeloa, F. (eds) Dyes and Photoactive Molecules in Microporous Systems. Structure and Bonding, vol 183. Springer, Cham. https://doi.org/10.1007/430_2020_64
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