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 2 2024
Accepted
11 6 2024
First published
12 6 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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