Rotation of a Bulky Triptycene in the Solid State: Toward Engineered Nanoscale Artificial Molecular Machines
作者:Xing Jiang、Braulio Rodríguez-Molina、Narega Nazarian、Miguel A. Garcia-Garibay
DOI:10.1021/ja503467e
日期:2014.6.25
We report the design and dynamics of a solid-state molecular rotor with a large triptycene rotator. With a cross-section and surface area that are 2 and 3 times larger than those of the phenylene rotators previously studied in the solid state, it is expected that van der Waals forces and steric hindrance will render the motion of the larger triptycene more difficult. To address this challenge, we used a rigid and shape-persistent stator in a dendritic structure that reaches ca. 3.6 nm in length. Using variable-temperature solid-state (2)H NMR spectroscopy, we determined a symmetric three-fold rotational potential with a barrier of 10.2 kcal/mol and a pre-exponential factor of 1.1 × 10(10) s(-1), which correspond to ca. 4600 Brownian jumps per second in the solid state at 300 K.
Enhanced Gearing Fidelity Achieved Through Macrocyclization of a Solvated Molecular Spur Gear
作者:Marcus J. Jellen、Ieva Liepuoniute、Mingoo Jin、Christopher G. Jones、Song Yang、Xing Jiang、Hosea M. Nelson、K. N. Houk、Miguel A. Garcia-Garibay
DOI:10.1021/jacs.1c01885
日期:2021.5.26
that favorably position and maintain the two gears in a meshed configuration. Here, we report the synthesis of a new macrocyclic molecular spur gear with a bibenzimidazole stator combined with a second naphthyl bis-gold-phosphine gold complex stator to place two 3-fold symmetric 9,10-diethynyl triptycene cogs at the optimal distance of 8.1 Å for gearing. Micro electron diffraction (μED) analysis confirmed
Giant Crystalline Molecular Rotors that Operate in the Solid State
作者:Rempei Ando、Ayana Sato‐Tomita、Hajime Ito、Mingoo Jin
DOI:10.1002/anie.202309694
日期:2023.11.20
(triptycene and pentiptycene) exhibit rotational dynamics in the solid state. It is revealed that encapsulation by a large concave NHC ligand provides reasonable rotational space around the central rotator. This platform will enable further design of systems in which large and complicated molecular units exhibit rotational motion in solid.