American Chemical Society
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A Pd24 Pregnant Molecular Nanoball: Self-Templated Stellation by Precise Mapping of Coordination Sites

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journal contribution
posted on 2015-07-29, 00:00 authored by Imtiyaz Ahmad Bhat, Dipak Samanta, Partha Sarathi Mukherjee
We found that Pd­(II) ion (M) and the smallest 120° bidentate donor pyrimidine (La) self-assemble into a mononuclear M(La)4 complex (1a) instead of the expected smallest M12(La)24 molecular ball (1), presumably due to the weak coordination nature of the pyrimidine. To construct such a pyrimidine bridged nanoball, we employed a new donor tris­(4-(pyrimidin-5-yl)­phenyl)­amine (L); which upon selective complexation with Pd­(II) ions resulted in the formation of a pregnant M24L24 molecular nanoball (2) consisting of a pyrimidine-bridged Pd12 baby-ball supported by a Pd12 larger mother-ball. The formation of the baby-ball was not successful without the support of the mother-ball. Thus, we created an example of a self-assembly where the inner baby-ball resembling to the predicted M12(La)24 ball (1) was incarcerated by the giant outer mother-ball by means of geometrical constraints. Facile conversion of the pregnant ball 2 to a smaller M12(Lb)24 ball 3 with dipyridyl donor was achieved in a single step.