Issue 29, 2009
From the journal:

Dalton Transactions

Na+ and Ca2+ ion selective pyridylcarboxylate rings of Pd(II) and Pt(II)†

Peili Teo,a   L. L. Kohb  and  T. S. Andy Hor*b  

* Corresponding authors

a NUS Graduate School of Integrative Sciences and Engineering, National University of Singapore, Singapore

b Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore
E-mail: andyhor@nus.edu.sg
Fax: 65 68731324

Abstract

A series of dinuclear Pd(II) and Pt(II) with central rectangular cavities have been self-assembled using pyridyl carboxylates as spacers and phosphines [1,1′-bis(diphenylphosphino)ferrocene (dppf) and triphenylphosphines] as supporting ligands. Some of these function as metallacrowns by capturing adventitious alkali or alkali earth metals ions. Two of the Pt(II) rings bind selectively to Na+ whereas the Pd(II) rings prefer Ca2+. Such endocyclic association with the metal ion is facilitated by the converging carbonyl pendants and supported by coordinated triflates. Affinity and selectivity are achieved through stereo-conformational control of the pendant carbonyls and the ring which are isomerically dependent on the spacer. These intermetallic complexes are characterized by X-ray single-crystal crystallography and solution spectroscopy (NMR and ESI-MS). A varied range of local geometries of Na+ and Ca2+ are revealed.

Graphical abstract: Na+ and Ca2+ ion selective pyridylcarboxylate rings of Pd(II) and Pt(II)

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Article information

DOI
https://doi.org/10.1039/B821379H
Article type
Paper
Submitted
28 Nov 2008
Accepted
22 May 2009
First published
29 Jun 2009

Dalton Trans., 2009, 5637-5646

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Na+ and Ca2+ ion selective pyridylcarboxylate rings of Pd(II) and Pt(II)

P. Teo, L. L. Koh and T. S. A. Hor, Dalton Trans., 2009, 5637 DOI: 10.1039/B821379H

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