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Issue 29, 2019
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Resolution of minor size differences in a family of heteroleptic coordination cages by trapped ion mobility ESI-MS

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Abstract

We report a complex system of heteroleptic coordination cages based on the combination of four bis-monodentate ligands whose backbones only slightly differ in shape and length. cis-[Pd2L2L′2] assemblies cleanly form after addition of PdII cations to a 1 : 1 mixture of two shape-complementary ligands, each. When three or even all four ligands are used in combination, the unambiguous discrimination of all individual species in the product mixture becomes difficult by conventional NMR spectroscopic and mass spectrometric methods. Due to steric constraints, the system is restricted to the formation of ten different coordination cages in total, two of which are isomeric. We show that high-resolution trapped ion mobility mass spectrometry (TIMS) allows the clear differentiation of all ten species. Observed size trends could be readily reproduced by the calculation of theoretical values for collisional cross sections (CCS) from geometry-optimized models.

Graphical abstract: Resolution of minor size differences in a family of heteroleptic coordination cages by trapped ion mobility ESI-MS

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Supplementary files

Article information


Submitted
30 Apr 2019
Accepted
30 May 2019
First published
28 Jun 2019

This article is Open Access

Dalton Trans., 2019,48, 11070-11075
Article type
Paper

Resolution of minor size differences in a family of heteroleptic coordination cages by trapped ion mobility ESI-MS

K. E. Ebbert, L. Schneider, A. Platzek, C. Drechsler, B. Chen, R. Rudolf and G. H. Clever, Dalton Trans., 2019, 48, 11070
DOI: 10.1039/C9DT01814J

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