Enumeration by pólya's theorem of the isomerism in eight-coordinate complexes in square antiprismatic, triangular dodecahedral and hendecahedral (bicapped trigonal prismatic) geometries

Solid-state structural transformations in metal organic-inorganic hybrids constructed from terbium(iii) complexes and iodocuprate clusters

“…10 Isolated I 3 2 anions are not commonly observed in lanthanide halide chemistry, 8 and to the best of our knowledge, the derivatives trans-[LnI 2 (thf) 5 ][I 3 ] (Ln = Yb, La) 14 are the only known examples prior to this report. It should be noted that the dodecahedral geometry of terbium(III) centre observed 13 here in 4 is different from the distorted square prismatic geometry found in [Tb(DMSO) 8 ]I 3 (a). 11a The [Tb(DMF) 6 (H 2 O) 3 ] 3+ cation in 5 has a 9-coordinated terbium centre with a tricapped trigonal prismatic geometry.…”

“…The eight-coordinate terbium atom in the cation [TbL 8 ] 3+ (L = DMF or DMSO) has either a regular or distorted square antiprismatic or dodecahedral geometry. 13 As observed previously for other 8-coordinate terbium cations, 6a,11a the Tb-O bond distances in 1-4 vary from 2.316(3) to 2.409(11) A ˚.…”

X-ray diffraction, 133Cs and 1H NMR and thermal studies of CdZrCs1.5(H3O)0.5(C2O4)4·xH2O displaying Cs and water dynamic behavior

“…Both of them are built from [CdZr(C 2 O 4 ) 4 ] 22 anionic groups forming two different frameworks with a topology originating from the two frequent configurations in the stereochemistry of eight-fold coordination, i.e. the dodecahedron and the square antiprism [5,6]. With dodecahedra, the structure is built from a net of perpendicular zigzag chains with a ( -Cd-oxalate -Zr-oxalate -) 1 sequence and exhibits tunnels with square cross-sections.…”

Thermal dehydration of Y(TFA)3(H2O)3: Synthesis and molecular structures of [Y(μ,η1:η1-TFA)3(THF)(H2O)]1∞·THF and [Y4(μ3-OH)4(μ,η1:η1-TFA)6(η1-TFA)(η2-TFA)(THF)3(DMSO)(H2O)]·6THF (TFA=trifluoroacetate)

“…4). The geometry around the metal can be described as a bicapped trigonal prismatic [12]. The Y-O (TFA) bond distances, which range from 2.296(5) to 2.347(5) Å, are in agreement with the body of literature [5].…”

“…Eight appears as the preferential coordination number for yttrium trifluoroacetate compounds [5]. In contrast to 1, the yttrium atoms have either a regular (Y2, Y4) or slightly distorted (Y1, Y3) dodecahedral geometry [12]. .…”