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Synthesis and Properties of (+/-)-trans-(η2-Alkene)(4-alkoxy-4'-stilbazole)dichloroplatinum: a Remarkable Family of Low-melting Metallomesogens

DOI: 10.1039/DT9920003009

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 3009 - 3014 (1992)

Update date:2022-08-05

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Authors:

Rourke, Jon P.Rourke, Jon P.

Fanizzi, Francesco P.Fanizzi, Francesco P.

Bruce, Duncan W.Bruce, Duncan W.

Dunmur, David A.Dunmur, David A.

Maitlis, Peter M.Maitlis, Peter M.

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Article abstract of DOI:10.1039/DT9920003009

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 <(m+n) = 8 to ca. 13> show monotropic mesophases, while thosewith longer tails <(m+n) > 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.

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Product name:(+/-)-trans-(η2-hept-1-ene)dichloro(4-dodecyloxy-4'-stilbazole)platinum(II)

Cas No:126808-09-1

126808-09-1

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