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Utilizing two polycarboxylic acids as primary ligands and 1,10-phenanthrolion as an auxiliary ligand in the existence of lanthanide nitrates, two lanthanide-based complexes formulated as [Nd_4(2,6-pydc OH)_6(Phen)4(H_2O)2](H_2O)2(1) and [Yb_2(mBDC)_3(Phen