Caged bulky organic dyes in a polyaromatic framework and their spectroscopic peculiarities

Abstract

Host-guest structures and properties have been widely studied using relatively small dyes (<1 nm) without bulky groups, due to their smooth incorporation, efficient host-guest interactions, and high analytical accessibility. In...

Metal–organic cages for gas adsorption and separation

“…8(b)). In the 19 F NMR spectrum of the encapsulated CFCs within the MOC-11, new signals have been observed (Fig. 8(c)), indicating that the cage can adsorb all three CFCs in the neat liquid state, including CFCl 3 , CF 2 Cl 2 and CF 3 Cl.…”

“…Therefore, MOC-10 can adsorb gas molecules in water by virtue of its hydrophobic central cavity. As demonstrated by 1 H NMR and 19 F NMR, bubbling SF 6 gas into a D 2 O solution of MOC-10 can form a host-guest complex [SF 6 CMOC-10], with a good binding constant of (K a = 1.3 Â 10 4 M À1 ) (Fig. 7(b)).…”

“…There is typically a well-defined cavity in threedimensional MOCs that can be utilized for catalytic reaction, 8 molecular recognition, 9 guest stabilization, 10 and drug delivery. 11 Although the molecular recognition properties of these MOCs have been extensively studied and a wide range of guest molecules including cations, [12][13][14] anions [15][16][17] and neutral guests [18][19][20] can fit into the cavity of the MOCs through various interactions, the case of adsorbing gases within these MOCs remains rare.…”

Uncovering tetrazoles as building blocks for constructing discrete and polymeric assemblies

“…On the other hand, discrete coordination assemblies, which are comprised of metal-organic cages (MOCs) and metallacycles (MCs), exhibit better solubility in polar and non-polar solvents. [46][47][48][49] These structures have diverse applications ranging from catalysis, [50][51][52][53][54][55][56][57] selective separation, [58][59][60][61][62] fluorescence tuning, [63][64][65][66][67][68] sensing, [69][70][71] to photochromism. 72,73 Most self-assembled coordination assemblies use pyridines, carboxylates and imidazoles as the primary linking motifs to the metal centres.…”

Highly efficient Förster resonance energy transfer between an emissive tetraphenylethylene-based metal–organic cage and the encapsulated dye guest

“…Over the past few decades, coordination-driven assembled metal–organic cages have provided a sustainable way to echo the remarkable properties of natural enzymes, due to their facile synthesis, high solubility, and stability in common solvents. With their precisely controlled well-defined cavities, such supramolecular coordination hosts have been widely studied for selective guest encapsulation 1 and recognition, 2 using which highly efficient and stereoselective catalysis has been realized via substrate preorganization and the stabilization of reactive intermediates. 3,4 Besides these exciting confinement effects, host–guest systems with their essential components forced close together within the inner space of the cage are also promising candidates to use to develop supramolecular charge/energy donor–acceptor assemblies, which lead to efficient enhancement in energy, electron, or substance transfer, based on short through-space and long through-bond pathways.…”