Issue 29, 2024

A pair of conjoined trinuclear sub-frameworks in a pentanuclear double-cavity discrete coordination cage

Abstract

Combination of Pd(II) with selected bis-monodentate ligands produces the familiar multinuclear PdmL2m type self-assembled “single-cavity discrete coordination cages” (SCDCC). If the ligand provides parallel coordination vectors, then it forms a binuclear Pd2L4 type cage, whereas utilization of ligands having appropriately divergent coordination vectors results in specific higher nuclear complexes. In contrast, preparation of emergent “multi-cavity discrete coordination cages” (MCDCC) using Pd(II) and designer ligands is quite captivating where the neighboring cavities of the framework are conjoined with each other through a common metal center. A pair of conjoined binuclear Pd2L4 type sub-frameworks are present in a trinuclear Pd3L4 type double-cavity cage prepared from Pd(II) and a tris-monodentate ligand having parallel coordination vectors. The present work envisioned a design to make double-cavity coordination cages having a pair of conjoined trinuclear Pd3L6 type sub-frameworks. To fulfill the objective we combined Pd(II) with a mixture of designer bis-monodentate ligand (L) and tris-monodentate ligand (L′) in a 5 : 4 : 4 ratio in one pot to afford the targeted pentanuclear Image ID:d4sc01078g-t1.gif type cage. The choice of bis-monodentate ligand L is based on the divergent nature of the coordination vectors suitable to produce a Pd3L6 type SCDCC. The tris-monodentate ligand L′ having two arms is designed in such a manner that each of the arms reasonably resembles L. Study of the complexation behavior of Pd(II) with L′ provided additional guiding factors essential for the successful making of Image ID:d4sc01078g-t2.gif type MCDCC by integrative self-sorting. A few other MCDCC including lower symmetry versions were also prepared in the course of the work.

Graphical abstract: A pair of conjoined trinuclear sub-frameworks in a pentanuclear double-cavity discrete coordination cage

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Article information

Article type
Edge Article
Submitted
15 feb 2024
Accepted
11 jun 2024
First published
12 jun 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 11287-11301

A pair of conjoined trinuclear sub-frameworks in a pentanuclear double-cavity discrete coordination cage

S. Sharma, S. Krishnaswamy, S. Prusty and D. K. Chand, Chem. Sci., 2024, 15, 11287 DOI: 10.1039/D4SC01078G

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