Improved Properties of Ferroelectric Liquid Crystals from Palladium β‐Diketone Complexes

Ferroelectric metallomesogens composed of achiral spin crossover molecules

“…Recently, metal-containing LCs, the metallomesogens,19,20 have been widely investigated because they often exhibit interesting physical properties, including magnetic, electrical and optical properties, that are associated with the metal ion species in the anisotropic phases 21–23. Largely directed by metal ion complexation, various structural types of ferroelectric metallomesogens, including banana,24,25 open-book,26 K or H shape,27–30 brick-like31,32 and square pyramidal24,33 geometries have been constructed. In addition, we have reported [M(X-4C 18 -salmmen)] (M = Zn and Pt, X = R , S and rac ; salmmen = N , N ′-monomethylene-bis-salicylideneimine) complexes that displayed both ferroelectricity and luminescence properties even though racemic forms were present 24.…”

Board-like dibenzo[fg,op]naphthacenes: synthesis, characterization, self-assembly, and liquid crystallinity

“…2 However, boardlike small-molecule liquid crystals are quite uncommon, presumably, at least in part, because the synthesis of appropriately substituted cores is less straightforward than the synthesis of the cores typical of calamitics (e.g., biaryls) and discotics (e.g., triphenylenes). To date, the liquid crystal phases of reported [3][4][5][6][7][8][9][10] small-molecule compounds have typically been characterized by columnar stacking, by analogy with discotics.…”

Preparations for 1,4,7,11,14,17-hexa-thiacycloeicosane, 1,4,7-trithiecan-9-ol, 1,11 -dioxa-4,8,14,18-tetrathia-cycloeicosane, 1 -oxa-4,8-dithiacyclo-decane, and some complexes of iron, cobalt, nickel, and palladium

“…Likewise, rapid electron exchange kinetics have been measured for these complexes and have been attributed to the unique structural and electronic features of the ligands (17)(18)(19). Many important future applications of chemistry in areas such as materials science, catalysis, communications, and data storage devices will require the ability to adjust properties of existing substances (20). For example, achievement of a liquid crystal mesophase when a metal is added to an otherwise inactive organic molecule (21) and combination of the electrochemical capabilities of an organic system with the photoluminescence of a metal species through coordination can produce an electro-photoswitch device (22).…”