Journal
CHEMISTRY LETTERS
Volume 42, Issue 9, Pages 954-962Publisher
CHEMICAL SOC JAPAN
DOI: 10.1246/cl.130598
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [21350022, 24750032]
- Grants-in-Aid for Scientific Research [21350022, 23655024, 24750032] Funding Source: KAKEN
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Over the past few decades, many studies have been conducted on ultralong C-C bonds (bond length greater than 1.7 angstrom). This highlight review discusses the molecular design of ultralong C-C bonds and their bonding properties, especially their expandability. In particular, the ultralong C-C bonds in tetraarylpyracene derivatives can change in length by adopting a slightly different conformation in the crystalline state. This expandability of ultralong C-C bonds could be due to the smaller decrease in bond energy at a longer interatomic distance (>1.7 angstrom). This interesting property can be applied to stimulus-responsive materials, as illustrated in the thermochromism of a bis(methylacridan)-substituted pyracene crystal, since the thermally induced change in bond-length modifies the HOMO-LUMO gap.
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