Crystal structure of a new binuclear complex bis(2,4,6,8-tetramethyl-2,4,6,8-tetraazabicyclo(3.3.0)octane-3,7-dione-o,o′)-tetraaqua-hexakis(nitrato-o,o′)-dieuropium(III)

• Published in: Journal of structural chemistry 2016-07, Vol.57 (4), p.754-759
• Main Authors: Netreba, E. E., Sarnit, E. A., Shabanov, S. V., Velikozhon, A. A., Somov, N. V.
• Format: Article
• Language: English
• Subjects: Atomic; Atomic properties; Atomic structure; Atomic/Molecular Structure and Spectra; Chemistry; Chemistry and Materials Science; Crystal structure; Europium; Inorganic Chemistry; Molecular; Optical and Plasma Physics; Oxygen atoms; Physical Chemistry; Polyhedra; Solid State Physics
• ISSN: 0022-4766; 1573-8779
• DOI: 10.1134/S0022476616040181

A centrosymmetric binuclear complex of europium(III) nitrate with bicyclic bisurea (2,4,6,8-tetramethyl-2,4,6,8-tetraazabicyclo(3.3.0)octane-3,7-dione, or mebicar, Mk) [Eu(C 8 H 14 N 4 O 2 )(H 2 O) 2 (NO 3 ) 3 ] 2 ( I ) is synthesized and its atomic structure (CIF file CCDC No. 1451437) is determined. The crystals of I are triclinic: space group P 1 ¯ , a = 9.8343(4) Å, b = 10.2544(4) Å, c = 10.9411(4) Å, α = 74.366(3)°, β = 67.734(4)°, γ = 67.673(4)°, V = 934.32(7) Å 3 , ρ(calc.) = 2.03398 g/cm 3 , Z = 1. The europium atom is coordinated by two oxygen atoms of two Mk molecules connected by a symmetry operation, three bidentate nitrate anions, and two water molecules. The coordination polyhedron of the europium atom is a 10-vertex polyhedron, the Eu…Eu distance is 9.7433(6) Å.