The structure of tetrakis(acetonitrile)tetrachlorouranium(IV), [UCl4(C2H3N)4]

Cotton, F. Albert; Marler, David O.; Schwotzer, Willi

doi:10.1107/s0108270184007265

Cited by 15 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values are typical for tetravalent uranium bonded to terminal chloride anions and were found in other compounds. [40][41][42][43][44][45][46][47] Bond valence calculations 48 for uranium gave values of 4.01 (1) and 4.08 (2), which are in good agreement with the oxidation state +4. The resulting coordination polyhedron around the uranium cation is a distorted tricapped trigonal prism, UO c 6 O f 2 Cl (' c ': carboxylate; ' f ': formamide), with two carboxyl oxygens of chelating carboxylate groups and one oxygen from formamide function capping each of its square faces.…”

Section: Structures Descriptionsupporting

confidence: 53%

Coordination polymers of uranium(iv) terephthalates

et al. 2015

View full text Add to dashboard Cite

A series of tetravalent uranium terephthalates has been solvothermally synthesized in the solvent N,N-dimethylformamide (DMF) at temperature 100-150 °C with different water amounts. Composition diagrams have been determined for the U(4+) metallic cation in the presence of terephthalic acid, and their crystal structures revealed the occurrence of two- or three-dimensional coordination polymers. In the absence of water, a mixture of two polytypes T-U(2)Cl(2)(bdc)(3)(DMF)(4) (1) and M-U(2)Cl(2)(bdc)(3)(DMF)(4) (2) has been identified at low temperature (100-110 °C) for bdc/U = 1-4 (bdc = terephthalate linker). Their structures are built up from isolated uranium centers in nine-fold coordination, surrounded by 6 carboxyl oxygen atoms, 2 oxygen atoms coming from DMF molecules and one chlorine atom. The uranium cations are linked to each other through the bdc ligand in order to generate a 3D framework. By increasing the temperature (130-150 °C), a layered like compound has been isolated, U(2)(bdc)(4)(DMF)(4) (3). It is composed of discrete actinide centers in ten-fold coordination, with 8 carboxyl oxygen atoms and 2 oxygen atoms from DMF molecules. The connection of the UO10 units with the bdc linkers generates 2D sheets. When a controlled amount of water is added to the reaction medium, the crystallization of the UiO-66-like U(6)O(4)(OH)(4)(H(2)O)(6)(bdc)(6)·10DMF solid (containing a hexanuclear sub-unit) is observed for temperature 110-120 °C and the H(2)O/U molar ratio in the range of 2-10. At higher temperature (140-150 °C), a distinct phase appeared, U(2)O(2)(bdc)(2)(DMF) (4), which consists of infinite chains of uranium centers, linked to each other via the bdc ligands. Higher water contents led to the formation of urania UO(2).

show abstract

Section: Structures Descriptionsupporting

confidence: 53%

Coordination polymers of uranium(iv) terephthalates

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The U(1)N(1) bond is substantially shorter (about 0.1–0.2 Å) than expected for neutral8 or cationic9 uranium( IV )–nitrile dative interactions and indicates that the uranium–nitrile linkages holding together the trinuclear framework of 4 b are rather robust. Transition metal nitrile complexes exhibit a shortening of the MN bond, which has been attributed to better orbital overlap that arises from the sp hybridization of the nitrogen atom of the nitrile group 10a.…”

Section: Methodsmentioning

confidence: 80%

Actinide‐Mediated Cyclization of 1,2,4,5‐Tetracyanobenzene: Synthesis and Characterization of Self‐Assembled Trinuclear Thorium and Uranium Macrocycles

et al. 2006

View full text Add to dashboard Cite

Heavy metal triangles: A class of actinide metallomacrocycles has been prepared in which three (C5Me5)2An (An=Th, U) fragments are coordinated by three 5,6‐dicyano‐1‐methyl‐3‐(N‐methylamino)isoindolyl bridging ligands (N blue). The tetravalent actinide centers form a triangular array in the products obtained through an unprecedented actinide‐mediated cyclization of 1,2,4,5‐tetracyanobenzene and subsequent self‐assembly.

show abstract

“…The U−O and O−P distances for the coordinated triphenylphosphine oxide groups are 2.329(6) and 1.499(6) Å, respectively. Observation of a nearly linear U−OPPh 3 moiety is common in these compounds . Bis(triphenylphosphine oxide) compounds of the uranium(IV) halides have, in general, been shown to adopt a trans disposition, but a cis geometry has also been observed …”

Section: Resultsmentioning

confidence: 99%