Crystal and Molecular Structure of the Discogen bis[1,3-di(p−n-Decylphenyl)propane-1,3-dionato]palladium(II)

Discotic metallomesogens: Synthesis and properties of square planar metal bis(β-diketonate) complexes

“…[VO(DK7,7),] displayed a complicated thermal behaviour with several crystal-crystal transitions; however no mesophase could be observed for this complex nor for [VO(DK9, 9),]. The unsymmetric complexes [VO(DK7, 9),] and [VO(DK7,10),] and the complex [VO(DK82,82),] were non-mesomorphic.…”

“…The new unsymmetric complexes [Cu(DK7, 9),] and [Cu(DK7,10,] did not display mesomorphic behaviour, and their clearing points were in the range observed for the symmetric complexes with similar total chain-lengths. [Cu(acK8),] was also nonmesomorphic, with a clearing point of 181°C.…”

“…The unsymmetric complexes [VO(DK7, 9),] and [VO(DK7,10),] and the complex [VO(DK82,82),] were non-mesomorphic. The last complex did not crystallize on cooling from the isotropic liquid, and supercooled into a glass; as for the analogous copper complex, the melting point was significantly reduced compared to those of the [VO(DKn,n),].…”

“…However, the palladium complex of 1,3-bis(4-n-decylphenyl)-propane-1,3-dione was reported to show a discotic mesophase [9]; the nickel analogues showed no mesomorphism [lo], an unsurprising result since they would be expected to have polynuclear octahedral structures. The related oxovanadium complex ( R = R' = -OCIoH,,), was recently reported to exhibit a monotropic discotic mesophase over a short temperature range 11 11.…”

Crystal and molecular structure of the discogen bis [(1-4-n-heptylphenyl,3-4-n-heptyloxyphenyl)propane-1,3-dionato] copper(II)

“…The copper atom is significantly displaced from the plane of the coordinating oxygen atoms, the displacement being 0.027 (2) di. This feature is in striking contrast with the in-plane arrangement of the metal atom observed in the crystal structures of the discogens (I), (11) and (111) in figure 1.…”