NOVEL LIQUID-CRYSTALLINE DERIVATIVES OF TRANSITION-METALS - THE EFFECT OF THE MOLECULAR-GEOMETRY OF THE LIGANDS ON THE MESOGENIC PROPERTIES OF TETRACOORDINATED COPPER(II) COMPLEXES

被引:46
作者
MARCOS, M [1 ]
ROMERO, P [1 ]
SERRANO, JL [1 ]
BARBERA, J [1 ]
LEVELUT, AM [1 ]
机构
[1] UNIV PARIS 11, PHYS SOLIDES LAB, F-91405 ORSAY, FRANCE
关键词
D O I
10.1080/02678299008029211
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The synthesis, characterization and thermal behaviour of several new series of copper(II) complexes derived from carbonylic compounds and their Schiff’s bases are reported. The complexes are of two types; [Cu(C6H3O(R)-C(X) = O)2], (type I) and [Cu(C6H3O(R)-C(X) = N-R′)2] (type II) where R = - OOC-C6H4OC10H21-p, and the position of R is 4 or 5; R′ = CH3, n-C10H21, p-n-C10H21O(C6H4)-; X ˭ H, CH3. In type I complexes, only the compound with X ˭ H and R in position 5 showed mesomorphism. For type II complexes, all the Schiff’s bases complexes of copper(II) derived from 2,4-dihydroxybenzaldehyde showed thermotropic mesophases (smectic C and nematic), whereas the complexes derived from 2,5-dihydroxybenzaldehyde were only mesogenic when the imine was derived from methylamine. None of the complexes derived from the ketone (2,4 or 2,5-dihydroxy derivatives) showed liquid-crystalline properties. X-ray studies of four complexes of type II were carried out. The anisotropy of the magnetic susceptibility has a negative sign for complexes with R in position 4 and a positive sign for 2,5-derivative complexes. The relationship between molecular structure and mesomorphic behaviour is discussed. © 1990 Taylor & Francis Group, LLC.
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页码:251 / 259
页数:9
相关论文
共 24 条
[1]   METALLO-MESOGENS AND LIQUID-CRYSTALS WITH A HEART OF GOLD [J].
ADAMS, H ;
BAILEY, NA ;
BRUCE, DW ;
DHILLON, R ;
DUNMUR, DA ;
HUNT, SE ;
LALINDE, E ;
MAGGS, AA ;
ORR, R ;
STYRING, P ;
WRAGG, MS ;
MAITLIS, PM .
POLYHEDRON, 1988, 7 (19-20) :1861-1867
[2]   NEW ORGANOMETALLIC LIQUID-CRYSTALS .1. ORTHOPALLADATED IMINE DERIVATIVES [J].
BARBERA, J ;
ESPINET, P ;
LALINDE, E ;
MARCOS, M ;
SERRANO, JL .
LIQUID CRYSTALS, 1987, 2 (06) :833-842
[3]   LINEAR-CHAIN BEHAVIOR OF SPIN-1/2 COPPER SALT ALPHA-BIS(N-METHYLSALICYLALDIMINATO)-COPPER(II) [J].
BARTKOWSKI, RR ;
MOROSIN, B .
PHYSICAL REVIEW B-SOLID STATE, 1972, 6 (11) :4209-+
[4]  
CARFAGNA C, 1987, MAKROMOL CHEM-RAPID, V8, P345
[5]   A THERMOTROPIC BIAXIAL NEMATIC LIQUID-CRYSTAL [J].
CHANDRASEKHAR, S ;
RATNA, BR ;
SADASHIVA, BK ;
RAJA, VN .
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1988, 165 :123-130
[6]   LYOTROPIC NEMATICS - MOLECULAR AGGREGATION AND SUSCEPTIBILITIES [J].
CHARVOLIN, J ;
LEVELUT, AM ;
SAMULSKI, ET .
JOURNAL DE PHYSIQUE LETTRES, 1979, 40 (22) :L587-L592
[7]  
Demus D, 1978, TEXTURES LIQUID CRYS
[8]   ELECTRON-SPIN-RESONANCE OF A ONE-DIMENSIONAL HEISENBERG-ANTIFERROMAGNET WHICH UNDERGOES A CRYSTALLINE TO DISCOTIC PHASE-TRANSITION [J].
EASTMAN, MP ;
HORNG, ML ;
FREIHA, B ;
SHEU, KW .
LIQUID CRYSTALS, 1987, 2 (02) :223-228
[9]  
GALYAMETDINOV YG, 1988, ZH OBSHCH KHIM+, V58, P1326
[10]   NEW LIQUID-CRYSTALLINE COMPOUNDS CONTAINING TRANSITION-METALS [J].
GHEDINI, M ;
ARMENTANO, S ;
BARTOLINO, R ;
RUSTICHELLI, F ;
TORQUATI, G ;
KIROV, N ;
PETROV, M .
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1987, 151 :75-91