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New liquid crystalline materials based on orthometallated palladium(II) and platinum(II) complexes with S,O –donor CO - ligands

V. CÎRCU1,* , M. ILIŞ1, F. DUMITRAŞCU2

Affiliation

  1. Inorganic Chemistry Department, University of Bucharest, 23 Dumbrava Rosie st., 020464 Bucharest, sector 2, Romania
  2. Centre of Organic Chemistry “C. D. Nenitzescu”, Romanian Academy, Spl. Independentei 202B, Bucharest 060023, Romania

Abstract

In this paper we present the preparation and the mesogenic behaviour of a series of ortho-metallated palladium complexes with two different imine ligands carrying two or three alkoxy chains and having N-benzoyl thiourea derivatives as co-ligands. By choosing the appropriate imine ligand and N-benzoyl thiourea derivative, room temperature nematic or smectic phases can be induced in ortho-metallated Pt(II) and Pd(II) complexes, mesophases which are stable for hours at this temperature. First liquid crystals based on platinum complexes containing the N-benzoyl thiourea moiety are reported here and their mesogenic properties are compared with those of palladium analogues..

Keywords

Liquid crystals, Palladium, platinum, Orthometallation, N-benzoyl thiourea.

Submitted at: Feb. 15, 2008
Accepted at: Dec. 10, 2008

Citation

V. CÎRCU, M. ILIŞ, F. DUMITRAŞCU, New liquid crystalline materials based on orthometallated palladium(II) and platinum(II) complexes with S,O –donor CO - ligands, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3454-3460 (2008)