Two isostructural metalcrownether coordination compounds, (15-crown-5)(BiCl3) 1 and (15-crown-5)(SbCl3) 2, are discovered to show phase transitions above room temperature, where the phase transition temperature relates to the metal center. Compound 1 crystallizes in the chiral orthorhombic space group P212121 in the low temperature phase and undergoes a reversible phase transition around 365 K to
Crown ether complexes of Bi<sup>III</sup>. Synthesis and crystal and molecular structures of BiCl<sub>3</sub>·12-crown-4 and 2BiCl<sub>3</sub>·18-crown-6
作者:Nathanial W. Alcock、Mythili Ravindran、Gerald R. Willey
DOI:10.1039/c39890001063
日期:——
Crownethercomplexes of bismuth(III) chloride of the types BiCl3·12-crown-4 (1), 2BiCl3·18-crown-6 (2), and BiCl3·15-crown-5 (3) have been prepared; compound (1), and probably compound (3), is a neutral adduct with the pyramidal BiCl3 linked to all four (five) oxygen atoms of the crown in a half-sandwich structure while compound (2) has the ionic formulation 2[BiCl2·18-crown-6]+[Bi2Cl8]2–, in which
Preparations and structural correlations for the complexes of <i>M</i>
<sup>III</sup> halides (<i>M</i> = As, Sb, Bi) with crown ethers: structures of AsCl<sub>3</sub>.12-crown-4, AsCl<sub>3</sub>.15-crown-5, SbCl<sub>3</sub>.12-crown-4 and BiCl<sub>3</sub>.15-crown-5 and an evaluation of relative binding strengths for crown ligands
作者:N. W. Alcock、M. Ravindran、G. R. Willey
DOI:10.1107/s0108768192009595
日期:1993.6.1
The preparations and structures of four new complexes are reported in the family of MCl3.crown complexes (M = As, Sb, Bi; crown = 12-crown-4, 15-crown-5, 18-crown-6). The structures of the eight isolable members of the family are compared and trends established. The M-O bonding is much weaker than the M-Cl bonding, becoming stronger in the order Bi > Sb > As and 12-crown-4 > 15-crown-5 > 18-crown-6. The Cl-M-Cl angles are reduced compared to those in the free halides, but the M-Cl bonds are only slightly lengthened. The crown torsion angles show characteristic patterns involving gauche C-C bonds and alternating gauche and anti C-O bonds.