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The reaction of EuI 2 (THF) 2 with potassium hydro-tris-(3,5-diiso-propyl-pyrazol-yl)borate (K[HB(3,5-  i Pr2 pz) 3 ] (= KTp  i Pr2 , 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-1 H -pyrazole)[hydro-tris-(3,5-diiso-propyl-pyrazol-yl)borato]iodido-europium(II), [Eu(C 27 H 46 BN 6 )I(C 9 H 16 N 2 ) 2 ] or (Tp  i Pr2 )(3,5-  i Pr2 pzH) 2 Eu II I, 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, C 36 H 62 B 2 H 8 or trans -{(3,5-  i Pr2 pz)HB(μ-3,5-  i Pr2 pz)} 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).

Formation and structural characterization of a europium(II) mono(scorpionate) complex and a sterically crowded pyrazabole