Copper-containing dendromesogens: the influence of the metal on the mesomorphism

Dendromesogens: Liquid Crystal Organizations versus Starburst Structures

“…Thus, preliminary studies with the poly(propylene imine) dendrimers (DABdendr) [15] yield comparable results. [16] Another interesting possibility for these materials is the introduction of metals into two different parts of the molecule: into the coordination position of the imine-hydroxy groups of the mesogenic core in a similar manner to the classical salicylidenamine metallomesogenic complexes, [17] or into the PAMAM central structure. [18] Complexation with metals would be expected to modify the dendrimeric structure and consequently the liquid crystalline properties.…”

“…For this purpose we have introduced 4,8,16,32, and 64 terminal mesogenic ester units by attaching them to the 0-, 1-, 2-, 3-, and 4-generation of PAMAM, respectively. These changes tune the properties of the dendrimers (Scheme 1).…”

“…With the exception of compound PAMAM-1.0-L 8 , the compounds Abstract in Spanish: Se describe la síntesis y el comportamiento como cristal líquido de una nueva serie de dendrímeros derivados de PAMAM. La serie consta de cinco nuevos compuestos que contienen 4,8,16, 32 y 64 unidades Øster meso Âgenas perifØricas enlazadas a la generacio Ân 0, 1, 2, 3 y 4 de poli(amidoamina) (PAMAM), respectivamente. Los cinco compuestos investigados presentan una mesofase esmØctica A, para la que se propone un modelo estructural vaÂlido para varias generaciones de dendrímeros.…”

EPR Characterisation of CuII Complexes of Poly(propylene imine) Dendromesogens: Using the Orienting Effect of a Magnetic Field

“…Then, only incompatible parts in the dendrimeric molecules lead by microsegregation to liquid crystalline ordering. [5b, 6b] Later, the first dendrimeric metallomesogens with poly(ethylene imine) ligands for the complexation of copper, cobalt, nickel and zinc, [9] ferrocene-containing liquid crystalline dendrimers [10] and copper(ii)-containing poly(propylene imine), PPI, dendrimers [11] were described. The interest in such dendrimeric metallomesogens is motivated by the possibility of obtaining materials, which combine the characteristics of poly(propylene imine) dendrimers (well-defined structure, higher molar masses, a polar core with an apolar periphery, behaviour as molecular micelles [1,2] ) and the properties of liquid crystals (organised mesophases, orientation behaviour in external fields) with those of metal complexes (appropriate electronic, magnetic or optical properties).…”

Self-assembly using dendritic building blocks—towards controllable nanomaterials

“…They employed the mesogen functionalised polyamine dendritic framework to bind copper ions. EPR studies have been performed to investigate the effects arising from the paramagnetism of Cu(II) [190]. These workers have also compared the relative LC behaviours of PPI derived and PAMAM derived dendritic systems.…”