A Tetravalent Plutonium Organic Framework Containing [Pu2O16] Dimers as Secondary Building Units: Synthesis, Structure, and Radiation Stability

The second example of tetravalent plutonium carboxyl-based organic framework, Pu-242(OH)[PO[(C6H4)COO](3)].H2O, termed as PuTPO (TPO = tris(4-carboxylphenyl)-phosphineoxide), was reported in this work. A series of characterizations of PuTPO, such as X-ray crystallography and solid-state UV-Vis-NIR spectroscopy, were carried out to expatiate its structure and physicochemical properties. PuTPO is constructed by dimers of the plutonium-oxygen subunit of [Pu2O16]. Characteristic peaks located at approximately 1100 nm can be considered to be the fingerprint peaks of tetravalent plutonium. While PuTPO can maintain high crystallinity within several months after synthesis, it exhibits a radiation-induced swelling effect probed by the expansion of cell parameter of b axis after self-irradiation from a-decay of Pu-242. This result enriches the inventory of tetravalent plutonium compounds and provides an insight into the irradiation resistance of metal-organic frameworks.

Automated summary

The second example of tetravalent plutonium carboxyl-based organic framework, PuTPO, is reported in this study. Characterizations such as X-ray crystallography and solid-state UV-Vis-NIR spectroscopy were conducted to elucidate its structure and physicochemical properties. PuTPO is composed of dimers of the plutonium-oxygen subunit of [Pu2O16]. The characteristic peaks around 1100 nm can be considered as the fingerprint peaks of tetravalent plutonium. PuTPO exhibits a radiation-induced swelling effect after self-irradiation, indicating its potential in radiation resistance for metal-organic frameworks.