126808-23-9Relevant articles and documents
Synthesis and Properties of (+/-)-trans-(η2-Alkene)(4-alkoxy-4'-stilbazole)dichloroplatinum: a Remarkable Family of Low-melting Metallomesogens
Rourke, Jon P.,Fanizzi, Francesco P.,Bruce, Duncan W.,Dunmur, David A.,Maitlis, Peter M.
, p. 3009 - 3014 (2007/10/02)
A novel series of low-melting metallomesogens (metal-containing liquid crystalls) has been prepared and characterised.Reaction of Zeise's salt K2-CH2=CH2)> with the 4-n-alkyloxy-4'-stilbazole ligands (L = CnH2n+1OC6H4CH=CHC5H4N; n = 3-12) yielded trans-2-CH2=CH2)L> 1, which react with alk-1-enes (CH2=CHCmH2m+1; m = 1-8, 10 or 12) to give trans- 2.The complexes where (m+n) ca. 8 are generally liquid crystalline (smectic A mesophases); those with shorter tails show monotropic mesophases, while thosewith longer tails ca.13> show enantiotropic behaviour.The melting temperatures are lower than would be anticipated for metallomesogens of this size, reflecting the non-centrosymmetric molecular structures which make the crystal packing less easy.A 70:30 mixture of the complexes 2 (n = 12, m = 3; K --> SA at 61 deg C) and (n = 12, m = 6; K --> SA at 70 deg C) shows the transition into the mesophase, K -->SA', at 45 deg C, an unusually low temperature.The mesophase to isotropic (SA -->I) transition temperatures remain rather constant at 92 +/- 4 deg C for all compositions.
