Upper-rim functionalization of calix[4]arene by chloro(isocyanide)gold(I) groups: an entry to polymetallic architecture

Fourfold symmetric MCR's via the tetraisocyanide 1,3-diisocyano-2,2-bis(isocyanomethyl)propane

We developed a gram-scale synthesis of the novel tetraisocyanide 1,3-diisocyano-2,2-bis(isocyanomethyl)propane and applied this in unprecedented fourfold Ugi four-component and Passerini three-component reaction achieving unique symmetric structures.

Calixarene-based alkynyl-bridged gold(i) isocyanide and phosphine complexes as building motifs for the construction of chemosensors and supramolecular architectures

A calixarene-based alkynyl-bridged Au(i) isocyanide complex with a triazolyl group as a receptor site has been synthesized and demonstrated to be a selective chemosensor for Zn²⁺ based on Au(i)⋯Au(i) interactions.

Synthesis and cation-binding studies of gold(i) complexes bearing oligoether isocyanide ligands with ester and amide as linkers

Bis(alkynyl)calix[4]arene gold(i) isocyanide complexes with amide linkers show strong binding affinity towards Al³⁺, which turns on the low-energy emission associated with the presence of Au(i)⋯Au(i) interactions.

Lower-rim substituted calixarenes and their applications

This review discusses in detail “calixarenes” since their discovery as by-products of the phenol formaldehyde bakelites till the present scenario wherein calixarene has assumed a new dimension in the field of supramolecular chemistry. Extensive literature exists for calixarenes; but herein we have tried to concentrate on the different lower-rim modified calixarenes with their potential applications. An attempt has also been made to critically evaluate the synthesis procedures for different lower-rim substituted calixarenes.

Gold Liquid Crystals Displaying Luminescence in the Mesophase and Short F⋅⋅⋅F Interactions in the Solid State

Rodlike gold(I) complexes, [Au(C6F4OCmH2m+1)(C(triple bond)NC6H4C6H4OCnH2n+1)] (m=2, n=4, 10; m=6, n=10; m=10, n=6, 10), display interesting features. They are liquid crystals and show photoluminescence in the mesophase, as well as in the solid state and in solution. The single-crystal, X-ray diffraction structure of [Au(C6F4OC2H5)(C(triple bond)NC6H4C6H4OC4H9)] confirms its rodlike structure, with a linear coordination around the gold atom, and reveals the absence of any Au...Au interactions (such interactions are often present in luminescent gold complexes). Well-defined, intermolecular Fortho...Fmeta interactions, with remarkably short intermolecular FF distances (2.66 A), are observed; these interactions seem to be responsible for the crystal packing, which consists of an antiparallel arrangement of molecules. Experiments under different conditions support the explanation that the photoluminescence has an intramolecular origin.

Wide-rim functionalization of calix[4]arene: The di- and tetraisocyanocalix[4]arene assembling ligands and their silver(I) polymers and oligomers

The 5,11- and 5,17-diisocyano-25,26,27,28-tetra-n-propoxycalix[4]arene bridging ligands (calix(NC)2) have been prepared in four steps with 34 and 30% global yields, respectively. Their corresponding Ag(I) complexes have been prepared from the direct reaction of the ligand with AgBF4 and are characterized from various spectroscopic and physical techniques. The MALDI-TOF spectra indicate the presence of polymers or oligomers of the type {Ag(calix(NC)2)(BF4)}n. The compounds have been characterized further from TGA, DSC, and XRD and compared with the oligomeric species 5,11,17,23-tetraisocyano-25,26,27,28-tetra-n-propoxycalix[4]arene silver(I) (as a BF4– salt).Key words: silver, calix[4]arene, polymer, isocyanide, photosensitive, thermal gravimetric analysis.