Synthesis, structure, and ferromagnetic behavior of decacopper(II) cluster complex supported by hexaanionic p-tert-butylthiacalix[6]arene

Toroidal moment and dynamical control in luminescent 1D and 3D terbium calixarene compounds

A toroidal moment can be generated spontaneously in inorganic (atom-based) ferrotoroidic materials that breaks both time-reversal and space-inversion symmetries, attracting great attention in solid-state chemistry and physics. In the field of molecular magnetism, it can also be achieved in lanthanide (Ln) involved metal-organic complexes usually with a wheel-shaped topological structure. Such complexes are called single-molecule toroics (SMTs), presenting unique advantages in spin chirality qubits and magnetoelectric coupling. However, to date, the synthetic strategies of SMTs have remained elusive, and the covalently bonded three-dimensional (3D) extended SMT has not hitherto been synthesized. Here, two luminescent Tb(iii)-calixarene aggregates with architectures of 1D chain (1) and 3D network (2) both containing the square Tb₄ unit have been prepared. Their SMT characteristics deriving from the toroidal arrangement of the local magnetic anisotropy axes of Tb(iii) ions in the Tb₄ unit have been investigated experimentally with the support of ab initio calculations. To the best of our knowledge, 2 is the first covalently bonded 3D SMT polymer. Remarkably, solvato-switching of SMT behavior has also been achieved for the first time by desolvation and solvation processes of 1.

A monomeric bowl-like pyrogallol[4]arene Ti12 coordination complex

Herein, an unprecedented monomeric bowl-like coordination complex, Ti₁₂PgC₃ (PgC₃ = C-propylpyrogallol[4]arene), has been successfully synthesized. To the best of our knowledge, Ti₁₂PgC₃ not only presents the first pyrogallol[4]arene-based titanium coordination complex, but also the highest nuclearity titanium coordination complex in the metal-calixarene system. In addition, this titanium coordination complex can effectively degrade the methylene blue (MB) dye under sunlight.

Molecular tectonics: dimensionality and geometry control of silver coordination networks based on pyrazolyl appended thiacalixarenes

Combinations of six new tetrakis-pyrazolyl appended calix[4]arenes derivatives, blocked in 1,3-A conformation as coordinating tectons, with AgX salts (X = NO₃⁻, BF₄⁻, XF₆⁻ (X = P, As and Sb)) lead to nine new silver coordination networks.

Photoluminescent and cytotoxic properties of multinuclear complexes and multinuclear-based polymers with group 12 metals and a tripodal ligand

Group 12 metal-based complexes constructed with a novel tripodal ligand display prominent photoluminescence, and zinc complex shows potential antitumor activity.

Molecular Pac-Man and Tacos: layered Cu(ii) cages from ligands with high binding site concentrations

Sheet Metal: The deliberate in situ Schiff base condensation of two organic subunits (hydroxamic acid and phenolic aldehyde) leads to polydentate ligands capable of forming large Cu(ii) cages of nuclearities ranging from [Cu₁₀] to [Cu₃₀].

Molecular tectonics: generation of grid and porous diamondoid coordination networks by calixarene based tectons

Combinations of tetrakis meta-pyridyl appended tetrathia- or tetrathiamercapto-calix[4]arene in 1,3-A conformation with MX₂ (M = Cd, Co or Fe, X = Cl or Br), behaving as a neutral metallatecton, lead to 2D grid type and 3D porous diamondoid coordination networks.

Molecular tectonics: pyridyl containing thiacalix[4]arene based tectons for the generation of 2- and 3-D silver coordination networks

Three new organic tectons (2–4) based on the p-tert-butylthiacalix[4]arene backbone, blocked in the 1,3-alternate conformation, bearing four pyridyl coordinating moieties, have been synthesised and characterised in the solid state. The ligands are positional isomers and differ by the position of the N atom on the pyridyl unit (ortho for 2, meta for 3 and para for 4). Their combination with the Ag+ cation leads, reproducibly, to the formation of 2- and 3-D infinite silver coordination networks. Independent of the nature of the anion, the combination of 2 offering four (N,S) type chelates with the Ag+ cation affords an unprecedented diamond type 3D network. Both 3 and 4, behaving as tetrakis monodentate ligands, lead to the formation of 2-D architectures.

A Dodecalanthanide Wheel Supported byp-tert-Butylsulfonylcalix[4]arene

A dodecaholmium wheel of [Ho12(L)6(mal)4(AcO)4(H2O)14] (1; mal = malonate) was synthesized by using p-tert-butylsulfonylcalix[4]arene (H4L) as a cluster-forming ligand. The wheel consists of three fragments of mononuclear A3- ([Ho(L)(mal)(H2O)]3-), trinuclear B3- ([Ho(H2O)2(mal)(Ho(L)(AcO))2]3-), and C3+ ([Ho(H2O)2]3+), and an alternate arrangement of these fragments (A(3-)-C(3+)-B(3-)-C(3+)-A(3-)-C(3+)-B(3-)-C(3+)-) results in a wheel structure. The longest and shortest diameters of the core were estimated to be 17.7562(16) and 13.6810(13) A, respectively, and the saddle-shaped molecule possesses a pocketlike cavity inside.

Conformation-Controlled Luminescent Properties of Lanthanide Clusters Containing p-tert-Butylsulfonylcalix[4]arene

Dinuclear and cubane-shaped lanthanide cluster complexes containing EuIII)and TbIII were synthesized by step-by-step construction using p-tert-butylsulfonylcalix[4]arene as a cluster-forming ligand. The sulfonylcalixarene adopts a pinched-cone conformation in the dinuclear complexes and a cone conformation in the cubane complexes. Because the calixarene has a large pi-conjugate system expanding over the entire molecule, it behaves as a good antenna chromophore for UV and near-UV light, and a slight conformational change of the calixarene (from cone to pinched-cone and vice versa) has an effect on the energy levels of excited S1 and T1 states. As a result, selectivity is observed in the luminescent properties of dinuclear and cubane-shaped systems of EuIII and TbIII.