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Updated: Jun 27, 2026

Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
The Phosphate-Bridged Pentapalladium(II)-Containing 18-Tungsto-4-Phosphate [Pd5O2(HPO4)2(PW9O34)2]16-: Synthesis and
Lakita Khidtta1, Ananthu Rajan1, Mahmoud Elcheikh Mahmoud1
1School of Science, Constructor University, Campus Ring 1, Bremen 28759, Germany.
Abstract:
The pentapalladium(II)-containing 18-tungsto-4-phosphate [Pd5O2(HPO4)2(PW9O34)2]16- (Pd5) has been synthesized in a simple one-pot procedure reacting Pd2+ ions with the trilacunary precursor [A-α-PW9O34]9- at room temperature in aqueous dimethylarsinate buffer with some free phosphate ions. The polyanion Pd5 comprises a [Pd5O2(HPO4)2]2+ assembly sandwiched between two [A-α-PW9O34]9- units, and it was isolated as a hydrated sodium salt, Na16[Pd5O2(HPO4)2(PW9O34)2]·25H2O (Na-Pd5), which was characterized in the solid state by single-crystal XRD, FT-IR, TGA, and elemental analysis. In solution, Na-Pd5 was characterized by 31P NMR, ESI-MS, UV-vis, and small- and wide-angle X-ray scattering (SWAXS). Furthermore, Na-Pd5 was employed as a precatalyst immobilized on SBA-15-apts for the hydrogenation of o-xylene, which showed excellent activity and recyclability.
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