Organouranium complexes of pyrazole and pyrazolate. Synthesis and x-ray structures of U(C/sub 5/Me/sub 5/)/sub 2/Cl/sub 2/(C/sub 3/H/sub 4/N/sub 2/), U(C/sub 5/Me/sub 5/)/sub 2/Cl(C/sub 3/H/sub 4/N/sub 2/), and U(C/sub 5/Me/sub 5/)(C/sub 3/H/sub 3/N/sub 2/)/sub 2/

Journal Article · Thu Jul 01 04:00:00 EDT 1982 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00137a025· OSTI ID:6652379

Eigenbrot, Jr, C W; Raymond, K N

The title compounds have been prepared by the reaction between U(C/sub 5/Me/sub 5/)/sub 2/Cl/sub 2/ and pyrazole (C/sub 3/H/sub 4/N/sub 2/), or sodium pyrazolate (NaC/sub 3/H/sub 3/N/sub 2/), in THF. The new compounds are characterized by their infrared, /sup 1/H NMR visible-near-IR, and mass spectra and by single-crystal x-ray diffraction (monochromatic Mo K..cap alpha.. radiation). The molecular structure of U(C/sub 5/Me/sub 5/)/sub 2/Cl/sub 2/(C/sub 3/H/sub 4/N/sub 2/) consists of discrete mononuclear units at positions of mm (C/sub 2..nu../) symmetry. The U/sup 4 +/ ion is coordinated by two eta/sup 5/-pentamethylcyclopentadienide rings, two chloride ions, and one nitrogen atom from the neutral pyrazole ring, for a total coordination number of 9. The average U-C bond distance is 2.74 (2) A, the U-N bond distance is 2.607 (8) A, and the U-Cl distance is 2.696 (2) A. This compound exhibits Curie-Weiss behavior. The molecular structure of U(C/sub 5/Me/sub 5/)/sub 2/Cl(C/sub 3/H/sub 3/N/sub 2/) consists of discrete U/sup 4 +/ ions coordinated by two eta/sup 5/pentamethylcyclopentadienide rings, one chloride ion, and both nitrogen atoms from the pyrazolate anion, for a total coordination number of 9. This compound exhibits Curie-Weiss behavior. The molecular structure of U(C/sub 5/Me/sub 5/)/sub 2/(C/sub 3/H/sub 3/N/sub 2/)/sub 2/ consists of discrete mononuclear U/sup 4 +/ ions coordinated by two eta/sup 5/-pentamethylcyclopentadienide rings and four nitrogen atoms from the two pyrazolate anions, for a total coordination number of 10. 7 figures, 10 tables.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6652379
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 21:7; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
ALKENES
AZOLES
BOND ANGLE
BOND LENGTHS
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
COMPLEXES
CRYSTAL STRUCTURE
CYCLOALKENES
DATA
DIENES
DIFFRACTION
DIMENSIONS
DISTANCE
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
INFRARED SPECTRA
INTERATOMIC DISTANCES
LENGTH
LIGANDS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MAGNETIC SUSCEPTIBILITY
MASS SPECTRA
MOLECULAR STRUCTURE
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHYSICAL PROPERTIES
POLYENES
PYRAZOLES
RESONANCE
SAMPLE PREPARATION
SCATTERING
SPACE GROUPS
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
URANIUM CHLORIDES
URANIUM COMPLEXES
URANIUM COMPOUNDS
VISIBLE SPECTRA
X-RAY DIFFRACTION