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Coordination Chemistry of Homoleptic Actinide(IV)-Thiocyanate Complexes

Journal Article · · Chemistry - A European Journal
 [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)

Here, the synthesis, X-ray crystal structure, vibrational and optical spectroscopy for the eight-coordinate thiocyanate compounds, [Et4N]4[PuIV(NCS)8], [Et4N]4[ThIV(NCS)8], and [Et4N]4[CeIII(NCS)7(H2O)] are reported. Thiocyanate was found to rapidly reduce plutonium to PuIII in acidic solutions (pH<1) in the presence of NCS. The optical spectrum of [Et4N][SCN] containing PuIII solution was indistinguishable from that of aquated PuIII suggesting that inner-sphere complexation with [Et4N][SCN] does not occur in water. However, upon concentration, the homoleptic thiocyanate complex [Et4N]4[PuIV(NCS)8] was crystallized when a large excess of [Et4N][NCS] was present. This compound, along with its UIV analogue, maintains inner-sphere thiocyanate coordination in acetonitrile based on the observation of intense ligand-to-metal charge-transfer bands. Spectroscopic and crystallographic data do not support the interaction of the metal orbitals with the ligand π system, but support an enhanced AnIV–NCS interaction, as the Lewis acidity of the metal ion increases from Th to Pu.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1237917
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Journal Issue: 44 Vol. 21; ISSN 0947-6539
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Interaction of An VI with Isothiocyanate Ion in Water-Organic Media (An = U, Np, Pu) : Interaction of An journal November 2019
Plutonium chlorido nitrato complexes: ligand competition and computational metrics for assembly and bonding journal January 2018
Thiocyanate complexes of the lanthanides, Am and Cm journal January 2020
Stereochemistry of Bk, Cf, and Es in Oxygen-Containing Compounds journal September 2018
A Structural and Spectroscopic Study of the First Uranyl Selenocyanate, [Et4N]3[UO2(NCSe)5] journal February 2016


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