Perrhenate and Pertechnetate Complexes of U(IV), Np(IV), and Pu(IV) with Dimethyl Sulfoxide as an O-Donor Ligand

Abstract

A series of new dimethyl-sulfoxide-containing pertechnetates and perrhenates of tetravalent U, Np, and Pu were synthesized and structurally characterized by the X-ray diffractometry. In all the synthesized compounds, the actinide atoms were coordinated by eight DMSO molecules with or without an extra XO 4 − anion in the coordination sphere. This resulted in the square antiprismatic or capped square antiprismatic coordination of An atoms. Three or four XO 4 − anions play the role of outer-sphere anions. The electron and IR spectra of the compounds correlated with their crystal structure.

Effect of Reaction Time on Lanthanide Borate Perrhenate Complexes

“…The Re–O bond length ranges are 1.69(3)–1.743(12), 1.675(14)–1.74(2), 1.669(11)–1.746(10), 1.68(2)–1.74(3), and 1.683(13)–1.764(12) Å for Ce1 , Pr1 , Nd1 , Sm1 , and Eu1 , respectively. All bond distances and angles are consistent with what has previously been reported in the literature. − ,− Individual bond lengths can be found in Table .…”

“…The equatorial La–O bond lengths range from 2.599(13) to 2.706(14) Å, while the Re–O bond lengths range from 1.66(2) to 1.754(15) Å. All bond distances and angles are consistent with what has previously been reported in the literature. − ,− Individual bond lengths can be found in Table .…”

“…displayed by both borate and perrhenate, assignment of vibrational bands can be difficult. Furthermore, the lowered symmetry of the coordinated units also shifts their vibrational frequencies. ,− The characteristic vibrational peaks for borate are 1100–1400 cm –1 (BO 3 ) and 800–1000 cm –1 (BO 4 ). , The characteristic vibrational peak of free ReO 4 – is known to be located at 920 cm –1 . , These peaks, in addition to the vibrational mode of water, are observed in the corresponding spectra.…”

“…− is known to be located at 920 cm −1 . 44,62 These peaks, in addition to the vibrational mode of water, are observed in the corresponding spectra.…”