270 research outputs found
cyclo-Tetra-ÎĽ-fluorido-1:2Îş2 F;2:3Îş2 F;3:4Îş2 F;1:4Îş2 F-octaÂnitrato-1Îş8 O,O′;3Îş8 O,O′-tetraÂkisÂ(1,10-phenanthroline)-2Îş4 N,N′;4Îş4 N,N′-2,4-dichromium(III)-1,3-dineodymium(III) methanol tetraÂsolvate monohydrate
In the title compound, [Cr2Nd2F4(NO2)8(C12H8N2)4]·4CH3OH·H2O, two cis-difluoridobis(1,10-phenanthroline)chromium(III) fragments containing octaÂhedrally coordinated chromium(III) bridge via fluoride ions to two tetraÂnitratoneodymate(III) fragments, forming an uncharged tetraÂnuclear square-like core. The fluoride bridges are fairly linear, with Cr—F—Nd angles of 168.74 (8)°. Cr—F bond lengths are 1.8815 (15) Å, slightly elongated compared to those of the parent chromium(III) complex, which has bond lengths ranging from 1.8444 (10) to 1.8621 (10) Å. The tetraÂnuclear complex is centered at a fourfold rotoinversion axis, with the Cr and Nd atoms situated on two perpendicular twofold rotation axes. The uncoordinated water molÂecule resides on a fourfold rotation axis. The four methanol solvent molÂecules are located around this axis, forming a cyclic hydrogen-bonded arrangement. The title compound is the first structurally characterized example of unsupported fluoride bridges between lanthanide and transition metal ions
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