Tetranuclear Lanthanide Aqua Hydroxo Complexes with Macrocyclic Ligand Cucurbit[6]uril

Abstract

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Simple Coordination Complexes of Cucurbit[n]urils with Metal Ions

“…The above products are generally similar to a range of complexes formed from chloride [52] and bromide [39] lanthanide salts (Fig. 2.20b) in that sandwich complexes are generated; although, in particular complexes, some structural differences do occur-reflecting variation in the synthetic conditions and/or due to the intrinsic differences in the properties of the lanthanide cations themselves.…”

“…Fedin and coworkers have synthesized a series of polynuclear lanthanide complexes by reacting Q [6] with aqueous solutions of lanthanide(III) nitrates [51], chlorides [52] or bromides [39], Q [6], and 4-cyanopyridine under hydrothermal conditions (130 °C). These μ-hydroxo polynuclear lanthanide complexes are formed in aqueous solution and their formation involves hydrolysis of the corresponding Ln 3+ salts with, under the conditions employed, the 4-cyanopyridine also being hydrolyzed to isonicotinic acid.…”

One-Dimensional Coordination Polymers of Lanthanide Cations to Cucurbit[7]uril Built Using a Range of Tetrachloride Transition-Metal Dianion Structure Inducers

“…Cucurbit[n]urils(Q[n]s) [9][10][11][12][13][14] consist of a rigid hydrophobic cavity of low polarity, accessible through two open polar portals rimmed with carbonyl groups, which can interact with various metal ions [15][16][17][18][19][20][21][22][23][24][25][26], or their complexes [27][28][29][30][31][32][33][34][35][36][37][38][39][40] or clusters [41][42][43][44][45][46][47][48][49][50] [53]. In recent years, there has been a trend towards introducing an organic or inorganic species into the metal-Q[n] systems as a "structure inducer" or trigger, since the properties, structural novelties, and functionalities of the resulting coordination polymers have often exceeded those observed in the absence of such agents.…”

“…In recent years, there has been a trend towards introducing an organic or inorganic species into the metal-Q[n] systems as a "structure inducer" or trigger, since the properties, structural novelties, and functionalities of the resulting coordination polymers have often exceeded those observed in the absence of such agents. Following on from Fedin's work [30,32], Thuéry focused on the Q[n] complexation of lanthanides and actinides and demonstrated the formation of a series of lanthanide-Q[n] and uranyl-Q[n] supramolecular assemblies in the presence of added organic ligands [34][35][36][37]. Since a novel potassium-Q [5] supramolecular network was first prepared in the presence of p-hydroxybenzoic acid [60], coordination of metal ions to Q[n]s in the presence of various organic molecules has been extensively studied in our laboratory, and a strategy for inorganic or organic molecule-induced coordination polymers of metal ions to Q[n]s has gradually been established.…”

Direct coordination of metal ions to cucurbit[n]urils

“…Cucurbit[n]urils (Q[n]) readily include different organic molecules to form various hostguest inclusion complexes, pseudorotaxanes, catenanes, and molecular knots [25][26][27][28][29][30][31][32][33][34]. In addition, they also readily coordinate to metal ions, such as alkali and alkaline earth metal ions [35][36][37][38][39][40], transition metal ions [41][42][43], lanthanide metal ions, uranyl ions and their complexes [44][45][46][47][48][49][50][51] or clusters [52][53][54][55][56][57][58][59][60][61]. These interactions result in the formation of various exclusion complexes, one-dimensional (1D) or poly-dimensional architectures and frameworks.…”