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Control of Molecular Rotor Rotational Frequencies in Porous Coordination Polymers Using a Solid-Solution Approach

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posted on 30.09.2015, 00:00 by Munehiro Inukai, Tomohiro Fukushima, Yuh Hijikata, Naoki Ogiwara, Satoshi Horike, Susumu Kitagawa
Rational design to control the dynamics of molecular rotors in crystalline solids is of interest because it offers advanced materials with precisely tuned functionality. Herein, we describe the control of the rotational frequency of rotors in flexible porous coordination polymers (PCPs) using a solid-solution approach. Solid-solutions of the flexible PCPs [{Zn­(5-nitroisophthalate)x(5-methoxyisophthalate)1–x(deuterated 4,4′-bipyridyl)}­(DMF·MeOH)]n allow continuous modulation of cell volume by changing the solid-solution ratio x. Variation of the isostructures provides continuous changes in the local environment around the molecular rotors (pyridyl rings of the 4,4′-bipyridyl group), leading to the control of the rotational frequency without the need to vary the temperature.