In recent decades, strategically designed mechanically interlocked molecules (MIMs) such as rotaxanes and catenanes have emerged as potentially active prototypes in the fields of molecular machineries, switching, shuttling, organo-catalysis, host guest recognition and chemical sensing. Such MIMs having three-dimensional coordination spheres can be tuned in a unique topological manner to act as a flexible receptor to clasp selective ions/molecules in the chemically active pocket. In this context, herein we report, to the best of our knowledge, the first example of synthesis of a multifunctional [2]catenane composed of phenanthroline (phen), ester and oxy ether functionalities for the binding of trivalent lanthanide meta ions such as Eu3+ and Gd3+. Towards achieving our goal of synthesizing catenated host systems for binding of lanthanide metal ions, we have strategically designed our macrocycle (PhenMC), consisting of metal coordinating phen, ester and oxy ether moiety conjoined through a phenyl spacer and a new phen-ester- group embedded and alkene terminated ligand (Axle) in such a way to compliment the preference of lanthanide metal ions for high coordination numbers along with necessary flexibility of the macrocycle for enhanced binding of the guest lanthanide metal ions. Finally, we aimed towards the confirmation of the interlocked structure of the catenane by isolating the crystals of Na+ complex of CATN suitable for Single crystal X-ray crystallography.

A multifunctional catenated host for efficient binding of Eu3+ and Gd3+

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27th CRSI National Symposium in Chemistry

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