Molecular and crystal structures of calix[4]arene 1,3-di-n-propyl ether

Invariant water inclusion property of 1,3-alternate p-tert-butylthiacalix[4]arene tetra-methyleneoxycarboxylic acid

“…In complex 3, the four tert-butyl groups were found to be disordered. Split atoms were used for C(8)-C (10) ). The bipyridine of solvation lies about an inversion centre.…”

Geometrical and inclusion considerations in the formation of hexagonal nanotubes of calix[4]arene di-methoxycarbonyl methyl ester and acid

“…Concerning calix[n]arenes functionalised on the lower rim, such as calix [4]arene di-hydroxyphosphonic acid, there is an apparent constant in self-organisation, the same interpenetrating motif. 9 Such dimeric motifs are also present in the structures of di-propylether calix [4]arene 10 or di-cyanomethoxy calix [4]arene. 11 Other calix[n]arene derivatives, carrying one or more pendant acidic arms on the lower rim, give rise to architectures such as inclusion polymers 12 or nanotubes.…”

“…The angles between the para-carbon atoms describing the interdigitation are 157.3(6)u for 1 and 162.8(8) and 164.3(8)u for 2, as compared to that found for calix [4]arene dihydroxyphosphonic acid of 158.2u 9a or for dipropylether of calix [4] arene that is 162.3u. 10 These assemblies are ensured by C-H … p contacts between para-carbon atoms of one calixarene and the centroids of two of the aromatic rings of the other calixarene in the dimer (3.42 and 3.96 A ˚for 1 and 3.44 and 3.81, and 3.54 and 3.66 A ˚for each crystallographic independent molecule of 2). This yields the classical dimeric motif observed in many other disubstituted calix [4]arene derivatives.…”

“…This yields the classical dimeric motif observed in many other disubstituted calix [4]arene derivatives. 9, [10][11][12][13][14][15][16] The packing of these systems show similarity. For both structures, interactions between neighbouring calixarenes are formed by intermeshing gear type contacts generated by the interdigitation of the aromatic rings.…”

Helical aquatubes of calix[4]arene di-methoxycarboxylic acid

“…15 Such dimeric motifs are also present in the structures of dicyanomethoxy calix [4]arene 16 or dipropylether calix [4]arene. 17 In this paper, we have turned our attention to a calix [4]arene dimethoxycarboxylic acid (1). Here, in turn, a totally novel helical tube structure having interdigitated gear faces is observed.…”