A partially fluorinated ligand for two super-hydrophobic porous coordination polymers with classic structures and increased porosities

3-Ethyl-5-trifluoromethyl-1,2,4-triazole is synthesized by a one-pot reaction. Using this asymmetric triazole ligand bearing one trifluoromethyl and one ethyl as side groups, we construct two new porous coordination polymers, MAF-9 and MAF-2F, being isostructural with the classic hydrophobic and flexible materials, FMOF-1 and MAF-2, based on symmetric triazole ligands bearing two trifluoromethyl groups or two ethyl groups, respectively. MAF-9 and MAF-2F can adsorb large amounts of organic solvents but completely exclude water, showing superhydrophobicity with water contact angles of 152^o in between those of FMOF-1 and MAF-2. MAF-9 exhibits very large N₂-induced breathing and colossal positive and negative thermal expansions like FMOF-1, but the lower molecular weight and smaller volume of MAF-9 give 16% and 4% higher gravimetric and volumetric N₂ uptakes, respectively. In contrast, MAF-2F is quite rigid and does not show the inversed temperature-dependent N₂ adsorption and large guest-induced expansion like MAF-2. Further, despite the higher molecular weight and larger volume, MAF-2F possesses 6% and 25% higher gravimetric and volumetric CO₂ uptakes, respectively. These results can be explained by the different pore sizes and side group arrangements in the two classic framework prototypes, which demonstrate the delicate roles of ligand side groups in controlling porosity, surface characteristic and flexibility.

A novel tetrazolate- and cyanide-bridged three-dimensional heterometallic coordination polymer: crystal structure, thermal stability and magnetic properties

By using environmentally friendly K3[Co(CN)6] as a cyanide source, the solvothermal reaction of CuCl2 and tetrazole (Htta) led to a novel tetrazolate- and cyanide-bridged three-dimensional heterometallic CuII–CoIII complex, namely poly[[hexa-μ2-cyanido-κ12 C:N-pentakis(μ3-tetrazolato-κ3 N 1:N 2:N 4)cobalt(III)tetracopper(II)] monohydrate], {[CoIIICuII 4(CHN4)5(CN)6]·H2O} n , (I). The crystal structure analysis reveals that it is the first example of a (6,8,8)-connected three-dimensional framework with a unique topology, constructed from anionic [Co(CN)6]3− and cationic [(Cu1)2(tta)2]2+ and [(Cu2Cu3)(tta)3]+ units through μ2-cyanide and μ3-tetrazolate linkers. The compound was further characterized by thermal analysis, vibrational spectroscopy (FT–IR), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM–EDS) and magnetic measurements. The magnetic investigation indicates that the complex exhibits antiferromagnetic coupling between adjacent CuII cations.

Synthesis, crystal structures and luminescence properties of seven mononuclear zinc(II), cadmium(II), cobalt(II) and nickel(II) complexes with 5-(4-methylphenyl)-3-(pyridin-2-yl)-1H-1,2,4-triazole

Due to their versatile coordination modes and metal-binding conformations, triazolyl ligands can provide a wide range of possibilities for the construction of supramolecular structures. Seven mononuclear transition metal complexes with different structural forms, namely aquabis[3-(4-methylphenyl)-5-(pyridin-2-yl)-1H-1,2,4-triazolato-κ2 N 1,N 5]zinc(II), [Zn(C14H11N4)2(H2O)], (I), bis[5-(4-methylphenyl)-3-(pyridin-2-yl)-1H-1,2,4-triazole-κ2 N 3,N 4]bis(nitrato-κO)zinc(II), [Zn(NO3)2(C14H12N4)2], (II), bis(methanol-κO)bis[3-(4-methylphenyl)-5-(pyridin-2-yl)-1H-1,2,4-triazolato-κ2 N 1,N 5]zinc(II), [Zn(C14H11N4)2(CH4O)2], (III), diiodidobis[5-(4-methylphenyl)-3-(pyridin-2-yl)-1H-1,2,4-triazole-κ2 N 3,N 4]cadmium(II), [CdI2(C14H12N4)2], (IV), bis[5-(4-methylphenyl)-3-(pyridin-2-yl)-1H-1,2,4-triazole-κ2 N 3,N 4]bis(nitrato-κO)cadmium(II), [Cd(NO3)2(C14H12N4)2], (V), aquabis[3-(4-methylphenyl)-5-(pyridin-2-yl)-1H-1,2,4-triazolato-κ2 N 1,N 5]cobalt(II), [Co(C14H11N4)2(H2O)], (VI), and diaquabis[3-(4-methylphenyl)-5-(pyridin-2-yl)-1H-1,2,4-triazolato-κ2 N 1,N 5]nickel(II), [Ni(C14H11N4)2(H2O)2], (VII), have been prepared by the reaction of transition metal salts (ZnII, CdII, CoII and NiII) with 3-(4-methylphenyl)-5-(pyridin-2-yl)-1H-1,2,4-triazole (pymphtzH) under either ambient or hydrothermal conditions. These compounds have been characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. All the complexes form three-dimensional supramolecular structures through hydrogen bonds or through π–π stacking interactions between the centroids of the pyridyl or arene rings. The pymphtzH and pymphtz− entities act as bidentate coordinating ligands in each structure. Moreover, all the pyridyl N atoms are coordinated to metal atoms (Zn, Cd, Co or Ni). The N atom in the 4-position of the triazole group is coordinated to the Zn and Cd atoms in the crystal structures of (II), (IV) and (V), while the N atom in the 1-position of the triazolate group is coordinated to the Zn, Co and Ni atoms in (I), (III), (VI) and (VII).

The copper(i) metal azolate framework showing unusual coordination mode for the 1,2,4-triazole derivative and photocatalytic activity

A novel photocatalyst containing a tetranuclear Cu₄ cluster constructed by six 1,2,4-triazole units was reported where two of the six 1,2,4-triazole units show unusual bridging “crevice” coordination mode with their 1- and 2-positioned sp² N-atoms as symmetrically bridging centers.

Guest-containing supramolecular isomers of silver(i) 3,5-dialkyl-1,2,4-triazolates: syntheses, structures, and structural transformation behaviours

Using benzene as a template, a series of guest-containing silver(i) 3,5-dialkyl-1,2,4-triazolate isomers showing different structural transformation behaviours have been synthesized.

Poly[(μ3-3,5-diisopropyl-4H-1,2,4-triazolato-κ3N:N′:N′′)silver(I)]

In the polymeric title compound, [Ag(C₈H₁₄N₃)]_n, the Ag^I cation is coordinated by three N atoms from three 3,5-diisopropyl-1,2,4-triazolate anions in a T-shaped geometry. The Ag^I cation deviates from the coordination plane by 0.014 (1) Å and the N—Ag—N bond angles are 96.85 (11), 97.72 (10) and 165.39 (12)°. The triazolate anion bridges three Ag^I cations, forming a three-dimensional polymeric network.

Aluminum Dimer Containing Bulky 1,2,3-Triazolate Ligand

The first molecular aluminum 1,2,3-triazolato complex was synthesized bearing a bulky 1,2,3-triazolate ligand. Oligomers and polymers were avoided due to the bulkiness and noncoordinating nature of the substituents. The novel Al2N4ring formed contains symmetrical Al-N bond distances unexpectedly having asymmetric Al-N-N angles of 144.55(15)° and 115.83(14)°. This asymmetry demonstrates the effect of the steric hindrance of the ligand.

A three-dimensional chiral crystal structure constructed from a chiral triazolate ligand showing an SrSi2topology: poly[bis(μ3-3,5-diethyl-1,2,4-triazolato-κ3N1:N2:N4)trisilver nitrate]

In the title metal–organic framework (MOF), {[Ag3(C6H10N3)2]NO3}n, the AgIcation is coordinated by two N atoms from two different 3,5-diethyl-1,2,4-triazolate (detz) ligands in a linear configuration. Each AgIcation is then connected to two adjacent AgIcationsviaa μ3-N1:N2:N4-detrz ligand, resulting in a three-dimensional chiral silver–triazolate structure showing an SrSi2(srs) net with 103topology.

Two lanthanum(III) complexes containing η2-pyrazolate and η2-1,2,4-triazolate ligands: intramolecular C—H...N/O interactions and coordination geometries

The lanthanum(III) complexes tris(3,5-diphenylpyrazolato-κ2N,N′)tris(tetrahydrofuran-κO)lanthanum(III) tetrahydrofuran monosolvate, [La(C15H11N2)3(C4H8O)3]·C4H8O, (I), and tris(3,5-diphenyl-1,2,4-triazolato-κ2N1,N2)tris(tetrahydrofuran-κO)lanthanum(III), [La(C14H10N3)3(C4H8O)3], (II), both contain LaIIIatoms coordinated by three heterocyclic ligands and three tetrahydrofuran ligands, but their coordination geometries differ. Complex (I) has amer-distorted octahedral geometry, while complex (II) has afac-distorted configuration. The difference in the coordination geometries and the existence of asymmetric La—N bonding in the two complexes is associated with intramolecular C—H...N/O interactions between the ligands.