TY - JOUR
T1 - A Reduced-Symmetry Heterobimetallic [PdPtL4]4+ Cage
T2 - Assembly, Guest Binding, and Stimulus-Induced Switching
AU - Lisboa, Lynn S.
AU - Findlay, James A.
AU - Wright, L. James
AU - Hartinger, Christian G.
AU - Crowley, James D.
PY - 2020/6/26
Y1 - 2020/6/26
N2 - A strategy is presented that enables the quantitative assembly of a heterobimetallic [PdPtL4]4+ cage. The presence of two different metal ions (PdII and PtII) with differing labilities enables the cage to be opened and closed selectively at one end upon treatment with suitable stimuli. Combining an inert PtII tetrapyridylaldehyde complex with a suitably substituted pyridylamine and PdII ions led to the assembly of the cage. 1H and DOSY NMR spectroscopy and ESI mass spectrometry data were consistent with the quantitative formation of the cage, and the heterobimetallic structure was confirmed using single-crystal X-ray crystallography. The structure of the host–guest adduct with a 2,6-diaminoanthraquinone guest molecule was determined. Addition of N,N′-dimethylaminopyridine (DMAP) resulted in the formation of the open-cage [PtL4]2+ compound and [Pd(DMAP)4]2+ complex. This process could then be reversed, with the reformation of the cage, upon addition of p-toluenesulfonic acid (TsOH).
AB - A strategy is presented that enables the quantitative assembly of a heterobimetallic [PdPtL4]4+ cage. The presence of two different metal ions (PdII and PtII) with differing labilities enables the cage to be opened and closed selectively at one end upon treatment with suitable stimuli. Combining an inert PtII tetrapyridylaldehyde complex with a suitably substituted pyridylamine and PdII ions led to the assembly of the cage. 1H and DOSY NMR spectroscopy and ESI mass spectrometry data were consistent with the quantitative formation of the cage, and the heterobimetallic structure was confirmed using single-crystal X-ray crystallography. The structure of the host–guest adduct with a 2,6-diaminoanthraquinone guest molecule was determined. Addition of N,N′-dimethylaminopyridine (DMAP) resulted in the formation of the open-cage [PtL4]2+ compound and [Pd(DMAP)4]2+ complex. This process could then be reversed, with the reformation of the cage, upon addition of p-toluenesulfonic acid (TsOH).
KW - cages
KW - heterometallic complexes
KW - host–guest systems
KW - metallosupramolecular architectures
KW - stimuli-responsiveness
UR - http://www.scopus.com/inward/record.url?scp=85085945172&partnerID=8YFLogxK
U2 - 10.1002/anie.202003220
DO - 10.1002/anie.202003220
M3 - Article
C2 - 32220036
AN - SCOPUS:85085945172
SN - 1433-7851
VL - 59
SP - 11101
EP - 11107
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 27
ER -