Cyclotriveratrylene

Abstract: A tripodal cyclotriveratrylene-based ligand with chelating 2,2‘-bipyridine arms self-assembles with either Zn(NO3)2 or Co(NO3)2 to give 3-D trigonal bipyramidal [M3L2] cage assemblies. These cages triply interlock forming [2]catenane species that have been characterized by mass spectrometry and, in the case of the Zn(II) complex, by X-ray crystallography.

Abstract: The synthesis and structural and retrostructural analysis of a library of dendronized cyclotriveratrylene containing seven nonchiral and seven chiral self-assembling dendrons is reported. These dendronized cyclotriveratrylenes exhibit a crown conformation that we named dendritic crown. Selected examples of dendritic crowns self-assemble into helical pyramidal columns that self-organize into columnar crystals or into 2-D columnar hexagonal lattices with intracolumnar order. A second group of dendritic crowns self-assembles into helical pyramidal columns and spherical supramolecular dendrimers that self-organize into cubic and tetragonal lattices. A third group of dendritic crowns self-assembles only in spherical supramolecular dendrimers. The helical pyramidal columns and spherical supramolecular dendrimers assembled from dendronized cyclotriveratrylene containing nonchiral dendrons are chiral but racemic while those generated from chiral dendrons exhibit amplified chirality. Structural analysis by a combi...

Abstract: Treatment of the chloride bridged species [{M(L)Cl(μ-Cl)}2] (M = Ru, L = 4-MeC6H4CHMe2, C6H6, or C6Me6; M = Ir, L = C5Me5) with silver salts AgX (X = BF4, CF3SO3, CF3CO2 etc.) followed by reflux with the bowl-shaped macrocycle cyclotriveratrylene (CTV) results in the clean formation of mono-, di-, and trimetallic CTV complexes [{M(L)}n(CTV)]X2n (n = 1, 2, 3). Further salts (X = ReO4-, I-) may be generated by anion metathesis. All three types of complex display novel host−guest properties. In the case of the monometallic hosts the disruption of the characteristic columnar packing mode of the CTV, a result of the presence of the metal center, leads to the inclusion of neutral and anionic guest species (NO2Me, Et2O, H{CF3CO2}2-, etc.) within the CTV cavity. For complexes where n = 2 or 3 the inclusion of anionic guests is invariably observed. The extent of anion binding has been established by means of X-ray crystal structure determinations upon various di- and trimetallic species containing BF4-, CF3SO3-, o...