Molecular Structures and Catalytical Performance in Suzuki-coupling Reaction of Novel Dipalladium Clip-shaped Complexes with Bifunctional Pyrazolate Ligands

HU Xiao-Peng, WANG Zhi-Feng, DENG Wei, TONG Jin and YU Shu-Yan*

Chin. J. Struct. Chem. 2021, 40, 843-850  DOI: 10.14102/j.cnki.0254-5861.2011-3174

July 15, 2021

dipalladium supra molecules, bifunctional pyrazolate ligands, catalysis, Suzuki-coupling reaction

ABSTRACT

A series of clip-shaped cationic molecular corners C1~C4 (C1 = [(bpy)2Pd2(L1)2]2+, C2 = [(dmbpy)2Pd2(L1)2]2+, C3 = (bpy)2Pd2(L2)2]2+, C4 = (dmbpy)2Pd2(L2)2]2+, bpy = 2,2-bipyridine, dmbpy = 4,4΄-dimethyl-2,2-bipyridine) were synthesized through dipalladium complexes [(bpy)2Pd2(NO3)2](NO3)2, [(dmbpy)2Pd2(NO3)2](NO3)2 and bifunctional pyrazole ligands 4-(3,4-dimethoxyphenyl)-3,5-dimethyl-1H-pyrazol (HL1) and 4,4΄-(5-(1H-pyrazol-4-yl)-1,3-phenylene)dipyridine (HL2). Complexes C1~C4 were characterized by 1H and 13C NMR, electrospray ionization mass spectrometry (ESI-MS), elemental analysis, and IR spectroscopy. The X-ray diffraction analysis of C1∙2NO3 revealed a Pd2 dimetallic clip-shaped structure which was synthesized by two bifunctional ligands doubly bridged by the [(bpy)Pd]2 dimetal units. Additionally, all of the complexes with NO3 as counter anions exhibited high-efficiency catalytical performance in the Suzuki-coupling reaction attributed to the tunable impact and weak dinuclear Pd(II)···Pd(II) intramolecular bonding interaction.

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