Two three-dimensional actinide-silver heterometallic coordination polymers based on 2,2'-bipyridine-3,3'-dicarboxylic acid with helical chains containing dimeric or trimeric motifs

Under hydrothermal conditions, two new 3D actinide-silver (An-Ag) heterometallic coordination polymers, namely, [Ag(UO₂)₂(μ₂-OH)(bpdc)₂(H₂O)₂]_n (1) and [Ag₃Th₆(μ₃-O)(μ₃-OH)(μ₂-OH)₆(bpdc)₆(NO₃)₆.H₂O]_n (2, H₂bpdc = 2,2'-bipyridine-3,3'-dicarboxylic acid), were assembled through a hard-soft recognition strategy. Compounds 1 and 2 were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, and infrared spectroscopy. Both compounds are constructed through the bridging of infinite polynuclear An-bpdc chiral helical chains by Ag^I cations. Compound 2 represents the first Th^IV-Ag^I heterometallic coordination polymer. Furthermore, the thermal stability and luminescence properties of 1 were studied. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)