Synthesis, X-ray structures, and characterization of hexafluoro-iso-propoxide group 3 and lanthanide precursors

Abstract

A series of hydrated hexafluoro-iso-propoxide (hfip) lanthanide complexes was synthesized from the amide-alkoxide exchange reaction of the lanthanide bistrimethylsilyl amide dissolved in toluene and an excess amount of H-hfip. The products were isolated and identified by single crystal X-ray diffraction as: [cis-(H2O)2(hfip)2Ln(-hfip)]2 (Ln = Ce,

CO reductive oligomerization by a divalent thulium complex and CO2-induced functionalization

“…1.96 to 2.09 Å). 29 In line with the oxidation of the thulium metal center from the +II to the +III oxidation state, the sum of the two Tm–Cp(ctr) separations for each metal center in 2 , in the range 4.69–4.71 Å, is ca. 0.08 Å shorter than that in 1 .…”

Luminescent Er3+ based single molecule magnets with fluorinated alkoxide or aryloxide ligands

“…26 Expectedly the Er–μ 2 –O bonds for bridging alkoxide groups were found to be significantly longer (2.270(2)–2.303(2) Å) and only slightly shorter than the related distances in six-coordinate dimeric Er 3+ alkoxide {[(CF 3 ) 2 CHO] 2 Er(OH 2 ) 2 (μ-OCH(CF 3 ) 2 )} 2 (2.288(4)–2.33(4) Å). 68…”

Stereoisomerism in Lanthanide Complexes: Enumeration, Chirality, Identification, Random Coordination Ratios

“…If both coordination polyhedra display coordinations by the same ligands, so the compound appears symmetric from the point of view of its chemical formula, it is possible that each of the coordination polyhedra is not only chiral but has opposite absolute configurations, in which case such a dilanthanide compound would actually be a meso compound, that is, a complex with two chiral stereogenic metal centers of opposite absolute configurations. An example of a dilanthanide meso compound is complex bis­(μ-1,1,1,­3,3,3-hexafluoropropan-2-olato)-tetra-aqua-tetrakis­(1,1,1,­3,3,3-hexafluoropropan-2-olato)-dieuropium of CSD refcode ERUJIM; see Figure . This compound is not chiral, because it has an inversion center.…”

“…(top left) Skeleton of the compound of CSD refcode ERUJIM (from the crystallographic coordinates, without hydrogen and fluorine atoms); (top right) its structural formula. (bottom left) Structures of both of its lanthanide stereogenic centers, the right one rotated so that they can be clearly seen as a pair of enantiomers.…”