Patent ID: 6695977
Filing Date: 2004-02-24
Classification: C09K

Abstract:
A method, comprising mixing together at least one liquid crystalline material and at least one chiral, uncharged compound of the general formula Ia[(P1â€”Y1â€”A1â€”Y2â€”M1â€”Y3â€”)nL]2Meâ€ƒâ€ƒ(Ia) or Ib[(P1â€”Y1â€”A1â€”Y2â€”M1â€”Y3â€”)nL]Me(Lâ€²(â€”Y6â€”M2â€”Y5â€”A2â€”Y4â€”P2)nâ€²)mâ€ƒâ€ƒ(Ib), in which, independently of one another,P1 and P2 are hydrogen, C1-C12-alkyl, a group which is polymerizable or suitable for polymerization, or a radical which carries a group which is polymerizable or suitable for polymerization, Y1 to Y6 are a single chemical bond, â€”Oâ€”, â€”Sâ€”, â€”COâ€”, â€”COâ€”Oâ€”, â€”Oâ€”COâ€”, â€”COâ€”NCR)â€”, â€”(R)Nâ€”COâ€”, â€”Oâ€”COâ€”Oâ€”, â€”Oâ€”COâ€”N(R)â€”, â€”(R)Nâ€”COâ€”Oâ€” or â€”(R)Nâ€”COâ€”N(R)â€”, R is hydrogen or C1-C4-alkyl, A1 and A2 are spacers having from one to 30 carbon atoms, M1 and M2 are mesogenic groups, nâ€² and n are values of 0 or 1, m is a value of 1, 2 or 3, where the m Lâ€²(â€”Y6â€”M2â€”Y5â€”A2â€”Y4â€”P2)nâ€² groups in the formula Ib may be different, Me is a transition metal from the fourth, fifth or sixth period, with the exception of technetium, silver, cadmium, gold, mercury and the lanthanoids, or a main-group element from group 14 (in the TUPAC system), with the exception of carbon and lead, L is a tridentate ligand of the formula II in whichU, V and W are nitrogen-, oxygen-, phosphorus- or sulfur-containing groups which contain a nitrogen, oxygen, phosphorus or sulfur atom respectively having at least one free electron pair via which the coordination to the center Me takes place, b1 and b2 are alkylene or alkenylene bridges having two or three carbon atoms which are bonded to the nitrogen, oxygen, phosphorus or sulfur atom of the groups U and V (for b1) or of the groups V and W (for b2) and which, in the case of a C2-alkenylene bridge, may be substituted by up to two, in the other cases by up to four organic radicals having up to 12 carbon atoms, and in which two adjacent carbon atoms in the alkylene or alkenylene bridge may be part of an unsubstituted or substituted, simple or benzo-fused benzene ring, and Lâ€² is an organic radical having up to 12 carbon atoms.