Issue 41, 2021

Interconversion between a Pd3L2 trigonal prism and a Pd6L8 cube via anion exchange: binding affinity of monoatomic vs. polyatomic anions

Abstract

Systematic interconversion between trigonal prisms [Pd3X6L2] (X = Cl, Br, and I) and cubic cages [Pd6L8]12+(X)12 (X = BF4 and CF3SO3) via anion exchange was established. Self-assembly of K2PdX4 (X = Cl and Br) with a C3-symmetric tridentate 1,3,5-tris(2-isonicotinamidephenoxy)benzene (L) produces a trigonal prism, [Pd3X6L2]. Further photoreaction of the [Pd3X6L2] (X = Cl and Br) with CH2I2 gives rise to a halide-exchanged species, [Pd3I6L2]. In contrast, anion exchange of [Pd3X6L2] (X = Cl, Br, and I) with BF4 yields cubic-shaped cages, [Pd6L8]12+(BF4)12, with an inner cavity of 15.9 × 15.9 × 15.9 Å3. Successive anion exchange of [Pd6L8]12+(BF4)12 with CF3SO3 gives rises to anion-exchanged [Pd6L8]12+(CF3SO3)12 and vice versa without cage destruction. Thus, the cage system is specifically sensitive to anions, enabling cage formation to recognize the binding affinity and size of various anions.

Graphical abstract: Interconversion between a Pd3L2 trigonal prism and a Pd6L8 cube via anion exchange: binding affinity of monoatomic vs. polyatomic anions

Supplementary files

Article information

Article type
Paper
Submitted
15 Mar 2021
Accepted
15 Sep 2021
First published
16 Sep 2021

Dalton Trans., 2021,50, 14849-14854

Interconversion between a Pd3L2 trigonal prism and a Pd6L8 cube via anion exchange: binding affinity of monoatomic vs. polyatomic anions

H. Lee, J. Han, D. Kim and O. Jung, Dalton Trans., 2021, 50, 14849 DOI: 10.1039/D1DT00859E

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