Formation and structural characterization of a europium(II) mono(scorpionate) complex and a sterically crowded pyraza-bole.

Title Formation and structural characterization of a europium(II) mono(scorpionate) complex and a sterically crowded pyraza-bole.
Authors P. Liebing; M. Kühling; J. Takats; L. Hilfert; F.T. Edelmann
Journal Acta Crystallogr E Crystallogr Commun
DOI 10.1107/S2056989017016498
Abstract

The reaction of EuI2(THF)2 with potassium hydro-tris-(3,5-diiso-propyl-pyrazol-yl)borate (K[HB(3,5- iPr2pz)3] (= KTp iPr2, pz = pyrazol-yl) in a molar ratio of 1:1.5 resulted in extensive ligand fragmentation and formation of the europium(II) mono(scorpionate) complex bis-(3,5-diisopropyl-1H-pyrazole)[hydro-tris-(3,5-diiso-propyl-pyrazol-yl)borato]iodido-europium(II), [Eu(C27H46BN6)I(C9H16N2)2] or (Tp iPr2)(3,5- iPr2pzH)2EuIII, 1, in high yield (78%). As a typical by-product, small amounts of the sterically crowded pyraza-bole derivative trans-4,8-bis-(3,5-diiso-propyl-pyrazol-1-yl)-1,3,5,7-tetra-iso-propyl-pyraza-bole, C36H62B2H8 or trans-{(3,5- iPr2pz)HB(?-3,5- iPr2pz)}2, 2, were formed. Both title compounds have been structurally characterized through single-crystal X-ray diffraction. In 1, two isopropyl groups are each disordered over two orientations with occupancy ratios of 0.574?(10):0.426?(10) and 0.719?(16):0.281?(16). In 2, one isopropyl group is similarly disordered, occupancy ratio 0.649?(9):0.351?(9).

Citation P. Liebing; M. Kühling; J. Takats; L. Hilfert; F.T. Edelmann.Formation and structural characterization of a europium(II) mono(scorpionate) complex and a sterically crowded pyraza-bole.. Acta Crystallogr E Crystallogr Commun. 2017;73(Pt 12):19211925. doi:10.1107/S2056989017016498

Related Elements

Europium

See more Europium products. Europium (atomic symbol: Eu, atomic number: 63) is a Block F, Group 3, Period 6 element with an atomic radius of 151.964. Europium Bohr ModelThe number of electrons in each of Europium's shells is 2, 8, 18, 25, 8, 2 and its electron configuration is [Xe]4f7 6s2. The europium atom has an atomic radius of 180 pm and a Van der Waals radius of 233 pm. Europium was discovered by Eugène-Anatole Demarçay in 1896, however, he did not isolate it until 1901. Europium was named after the continent of Europe.Elemental Europium Picture Europium is a member of the lanthanide or rare earth series of metals. In its elemental form, it has a silvery-white appearance but it is rarely found without oxide discoloration. Europium is found in many minerals including bastnasite, monazite, xenotime and loparite. It is not found in nature as a free element.

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