Uranium(iv) terminal hydrosulfido and sulfido complexes: insights into the nature of the uranium–sulfur bond

Abstract

We report the synthesis and characterization of terminal uranium(iv) hydrosulfido and sulfido complexes, supported by the hexadentate, tacn-based ligand (Ad,MeArO)3tacn3–.

Assessing crystal field and magnetic interactions in diuranium-μ-chalcogenide triamidoamine complexes with UIV–E–UIV cores (E = S, Se, Te): implications for determining the presence or absence of actinide–actinide magnetic exchange

“…Plateaus such as these are but one of three experimentally observed low temperature profiles for mono and dimetallic uranium( iv ) species. In addition to plateaus, 48 , 56 continual Curie-like rising of the susceptibility 14 , 27 , 48 , 52 and Néel-type maxima 14 , 15 are also observed. Given that χ vs. T profiles are sometimes employed to directly infer the presence or absence of magnetic interactions between uranium ions, 14 , 15 , 27 it would be helpful to have a guide to aid in such interpretations; hence, we seek to simulate a set of magnetic traces for mono and dimetallic U IV species, to aid in the identification and characterisation of magnetic interactions.…”

“…1 + 1/8 S 8 to form “[(Tren TIPS )U V (S)]”, kinetic trapping of the postulated terminal sulfide complex by available 1 in solution with disproportionation of U V S···U III to U IV –S–U IV ought to be considered likely. It should be noted that Tren TIPS has proven capable of stabilising terminal uranium( v / vi )-nitrides and parent uranium( iv )-imide, -phosphinidene, and -arsinidene complexes, 5 , 28 – 35 but although these complexes suggest that stabilisation of a terminal sulfide should be possible 48 – 52 with Tren TIPS , the nitride is small compared to sulfide, whereas the pnictidenes are anionic formulations that would resist the formation of bridging species. Further, although dithorium bridging pnictido and pnictidiide complexes supported by Tren TIPS have been reported recently, 36 , 37 the analogous uranium complexes are yet to be reported which may be related to the larger size of thorium compared to uranium.…”

Multifunctional Inorganic‐Organic U‐MOF Materials with Nitrogen Heterocyclic Carboxylate: Synthesis, Structure and Properties

“…The U1 adopted sevencoordinate with a distorted [UO7] pentagonal bipyramid coordination geometry. Two oxygen atoms (O1, O2) was from the terminal oxygen of UO 2 2 + in axial direction and five oxygen atoms locating in the equatorial plane were from two distinct types: two oxygen atoms (O3, O4) from one carboxylate group in the form of bidentate and three oxygen atoms (O5, O6, O7) from three monodentate carboxylate groups of two TTHA 6À . The angle of O=U = O was 179.1(2)°approximately line with the bond length U=O of 1.761(4) Å and 1.754(4) Å.…”

“…It has been an active area of exploration on uranyl complexes since the suitable starting materials were discovered. [1,2] The uranium, as a good candidate element for mixed organicinorganic extended networks complexes has novel chemical compositions and physicochemical properties, [3][4][5][6][7] such as biomedical imaging, [8,9] luminescence sensors [10] and sensors over light-emitting devices (LEDs, OLEDs). [11,12] ion exchange, [13] proton conductivity, [14] intercalation chemistry, [15] photochemistry, [16] nonlinear optics, [17] selective oxidation catalysis, nuclear power, [18] X-ray attenuation and detection [19,20] and so on.…”

“…Finally, aromatic polycarboxylic acids could produce unique structures and characterization, due to their varied conformations and geometries. Here, with uranyl acetate as metal source, two new uranyl MOFs materials (2) were synthesized by hydrothermal condition, which were characterized by singlecrystal X-ray diffraction, IR spectroscopy, UV-Vis spectroscopy, elemental analysis, X-ray single crystal diffraction, and thermogravimetric analysis. In addition, their fluorescence properties, surface photovoltage properties as well as dyes adsorption properties have been studied primary.…”