Metallomesogens with extended bent tridentate receptors: columnar and cubic mesomorphism tuned by the size of the lanthanide metal ionsElectronic supplementary information (ESI) available: experimental procedures and characterization (elemental analyses, NMR, ESI-MS, conductivity) for L3, L3-C4 and L4 and for the complexes [Zn(L1)(NO3)2]·DMF (1), [Zn(Li)(NO3)2]·3H2O (i = 2: 2; i = 4: 3), [Zn(L3)(NO3)2]·H2O (4) and [Ln(L3)(NO3)3] (Ln = Eu, 5; Ln = Dy, 6; Ln = Lu, 7). Tables collecting selected bond distances and bite angles for 1 and L3-C4 and scattering vectors for 5–7. Figures showing intermolecular interactions in 1 and L3-C4, DSC traces for 2, 4 and 6 , birefringent textures for L3 and 7 and a CPK modeling for 7. See http://www.rsc.org/suppdata/dt/b2/b211902a/
Metallomesogens with extended bent tridentate receptors: columnar and cubic mesomorphism tuned by the size of the lanthanide metal ionsElectronic supplementary information (ESI) available: experimental procedures and characterization (elemental analyses, NMR, ESI-MS, conductivity) for L3, L3-C4 and L4 and for the complexes [Zn(L1)(NO3)2]·DMF (1), [Zn(Li)(NO3)2]·3H2O (i = 2: 2; i = 4: 3), [Zn(L3)(NO3)2]·H2O (4) and [Ln(L3)(NO3)3] (Ln = Eu, 5; Ln = Dy, 6; Ln = Lu, 7). Tables collecting selected bond distances and bite angles for 1 and L3-C4 and scattering vectors for 5–7. Figures showing intermolecular interactions in 1 and L3-C4, DSC traces for 2, 4 and 6 , birefringent textures for L3 and 7 and a CPK modeling for 7. See http://www.rsc.org/suppdata/dt/b2/b211902a/
The increase of the curvature of the interface between the rigid mesogenic core and the aliphatic chains in the hexacatenar tridentate ligand L3 overcomes the considerable expansion brought by the complexation of bulky metallic cores, thus leading to organized cubic mesophases for monometallic zincII and lanthanideIII complexes.
Enthalpy/Entropy Compensation in the Melting of Thermotropic Nitrogen‐Containing Chelating Ligands and Their Lanthanide Complexes: Successes and Failures
作者:Aude Escande、Laure Guénée、Emmanuel Terazzi、Thomas B. Jensen、Homayoun Nozary、Claude Piguet
DOI:10.1002/ejic.200901190
日期:2010.6
thermodynamics of liquid crystalline chelating nitrogen-containing ligands and their lanthanidecomplexes (i.e., lanthanidomesogens), we first go through the initial successes obtained with the introduction of the concept of enthalpy/entropycompensation for rationalizing and programming melting and clearing temperatures in thermotropic mesophases. In the second part, the failures encountered during our attempts