Supramolecular assembly of isocyanorhodium(i) complexes: An interplay of rhodium(i)···rhodium(i) interactions, hydrophobic-hydrophobic interactions, and host-guest chemistry
A series of tetrakis(isocyano)rhodium(I) complexes with different chain lengths of alkyl substituents has been found to exhibit a strong tendency toward solution state aggregation upon altering the concentration, temperature and solvent composition. Temperature- and solvent-dependent UV-vis absorption studies have been performed, and the data have been analyzed using the aggregation model to elucidate the growth mechanism. The aggregation is found to involve extensive Rh(I)···Rh(I) interactions that are synergistically assisted by hydrophobic-hydrophobic interactions to give a rainbow array of solution aggregate colors. It is noted that the presence of three long alkyl substituents is crucial for the observed cooperativity in the aggregation. Molecular assemblies in the form of nanoplates and nanovesicles have been observed in the hexane-dichloromethane solvent mixtures, arising from the different formation mechanisms based on the alkyl chain length of the complexes. Benzo-15-crown-5 moieties have been incorporated for selective potassium ion binding to induce dimer formation and drastic color changes, rendering the system as potential colorimetric and luminescent cation sensors and as building blocks for ion-controlled supramolecular assembly.
Chan, Alan Kwun-Wa,Wong, Keith Man-Chung,Yam, Vivian Wing-Wah
p. 6920 - 6931
(2015/06/16)
A new class of discotic mesogens derived from tris(N-salicylideneaniline)s existing in C3h and Cs keto-enamine forms
(Chemical Equation Presented) Two series of a unique class of columnar liquid crystals derived from tris(N-salicylideneaniline)s [TSANs] in which the proton and the electron interact with each other through the H-bonding environment are reported. The synt
Yelamaggad, Channabasaveshwar V.,Achalkumar, Ammathnadu S.,Rao, D. S. Shankar,Prasad, S. Krishna
p. 8308 - 8318
(2008/03/12)
Preparation of a highly alkyl-substituted dicatechol ligand and its dinuclear titanium(IV) complex
The highly alkyl-substituted dicatechol derivative 10-H4 is prepared with a triphenyl phosphite activated amide bond formation and a trifluoroacetic acid promoted dioxolane cleavage as the crucial steps in the reaction sequence. Compound 10-Hs
Albrecht,Schneider
p. 2234 - 2238
(2007/10/03)
Mesomorphic dithiooxamide complexes of platinum(II)
Complexation of non-mesomorphic dithiooxamide ligands to Pt(II) leads to square planar complexes which exhibit mesomorphic properties. The synthesis of these complex was accomplished in three steps: the formation of bisamides, starting from conveniently s