Discovery and Supramolecular Interactions of Neutral Palladium-Oxo Clusters Pd-16 and Pd-24

Identifier:  imarina:9099572

Handle: https://hdl.handle.net/20.500.11797/imarina9099572

Authors:  Bhattacharya, S; Basu, U; Haouas, M; Su, P; Espenship, MF; Wang, F; Solé-Daura, A; Taffa, DH; Wark, M; Poblet, JM; Laskin, J; Cadot, E; Kortz, U

Abstract:
We report on the synthesis, structure, and physicochemical characterization of the first three examples of neutral palladium-oxo clusters (POCs). The 16-palladium(II)-oxo cluster [Pd16O24(OH)(8)((CH3)(2)As)(8)] (Pd-16) comprises a cyclic palladium-oxo unit capped by eight dimethylarsinate groups. The chloro-derivative [Pd16Na2O26(OH)(3) Cl-3 ((CH3)(2) As)(8)] (Pd16Cl) was also prepared, which forms a highly stable 3D supramolecular lattice via strong intermolecular interactions. The 24-palladium(II)-oxo cluster [Pd24O44(OH)(8)((CH3)(2)As)(16)] (Pd-24) can be considered as a bicapped derivative of Pd-16 with a tetra-palladium-oxo unit grafted on either side. The three compounds were fully characterized 1) in the solid state by single-crystal and powder XRD, IR, TGA, and solid-state H-1 and C-13 NMR spectroscopy, 2) in solution by H-1, C-13 NMR and H-1 DOSY spectroscopic methods, and 3) in the gas phase by electrospray ionization mass spectrometry (ESI-MS).