Guest Ethanol Molecules Research Articles

Synthesis, structures and properties of three new compounds based on multidentate ligand containing triazole and pyrimidine

Three new compounds, namely, [Zn(mtpo)2(H2O)4](1), [Cd(mtpo)2·CH3CH2OH]n(2) and [Mn(mtpo)2·CH3CH2OH]n(3)(Hmtpo=4,7-dihydro-5-methyl-7-oxo-[1,2,4]triazolo[1,5-a]pyrimidine), have been synthesized via hydrothermal or solvothermal methods and characterized by means of elemental analyses, Fourier transform infrared(FTIR) spectroscopy, powder X-ray diffraction(PXRD), thermogravimetric analysis(TGA) and single-crystal X-ray diffraction. The results obtained from the single-crystal X-ray diffraction indicate that compound 1 has a mononuclear structure, and crystallizes in a monoclinic crystal system with P21/c space group, which exhibits a 2D supramolecular network constructed by hydrogen bonds and π-π interactions. Compounds 2 and 3 are isomorphous and crystallize in a tetragonal system with space group of I41/a. The M2+(M=Cd, Mn) ions in compounds 2 and 3 have the octahedral coordination geometry. Hmtpo acts as a bridging ligand linking the metal ions to form an infinite 3D framework with 4-connected {42·84} topology. There are hydrogen bonds between the guest ethanol molecules and the mtpo− ligands, which make the ethanol molecules exist in a 3D framework. In addition, luminescent properties of compounds 1 and 2 as well as magnetic property of compound 3 were investigated and water vapor adsorption and nitrogen sorption for compounds 2 and 3 were researched at 298 and 77 K, respectively.

Highly Efficient Separation of a Solid Mixture of Naphthalene and Anthracene by a Reusable Porous Metal–Organic Framework through a Single-Crystal-to-Single-Crystal Transformation

The three-dimensional crystalline porous metal-organic framework [Ni(2)(μ(2)-OH(2))(1,3-BDC)(2)(tpcb)](n) (1) [1,3-H(2)BDC = 1,3-benzenedicarboxylic acid; tpcb = tetrakis(4-pyridyl)cyclobutane] was used to separate a solid mixture of naphthalene and anthracene at room temperature via selective adsorption of naphthalene. The process involved a single-crystal-to-single-crystal transformation. The guest naphthalene molecules could be exchanged with ethanol, and the host, 1, could be regenerated by removal of the guest ethanol molecules.

Ferroelectric Porous Molecular Crystal, [Mn3(HCOO)6](C2H5OH), Exhibiting Ferrimagnetic Transition

A porous molecular crystal with guest ethanol molecules, [Mn3(HCOO)6](C2H5OH), was found to be a new type of multifunctional molecular system, which exhibits a ferroelectric transition at 165 K and a ferrimagnetic transition at 8.5 K. [Mn3(HCOO)6](C2H5OH) will give a hint to design "multiferroic" molecular materials where ferroelectric and ferromagnetic orders coexist.

A novel metal–organic supramolecular framework constructed by benzene-1,2,4-tricarboxylate: {[Fe(phen)(btc)(OH 2)] 2 · CH 3CH 2OH} n (btc=benzene-1,2,4-tricarboxylate)

A new metal–organic hybrid compound {[Fe(phen)(btc)(OH 2)] 2 · CH 3CH 2OH} n 1, has been solvatothermally synthesized and structurally characterized. Compound 1 exhibits a novel supramolecular framework which constructed by {[Fe(phen)(btc)(OH 2)] 2} dimers and the guest ethanol molecules.

Synthesis and crystal structure of [Ni{bis(2,5-dihydroxysalicylidene)ethylenediaminato}]: a hydrogen bonded assembly of Ni(II)–salen complex

The hydrogen bonded assembly of salen type complexes was studied. The nickel(II) complex with N, N ′-bis(2,5-dihydroxysalicylidene)ethylenediaminato was synthesized, and structurally characterized. The compound has two hydroxy groups at the both terminals of the tetradentate ligand. One of the two hydroxy groups of the nickel(II) complex forms a hydrogen bond with a coordinating oxygen donor of the adjacent molecule to yield a hydrogen bonded one-dimensional chain. These chains are also associated by π–π interactions with interlocking fashion to produce a two-dimensional structure. The guest ethanol molecules are incorporated between the two-dimensional layers.

Nanoporous, Interpenetrated Metal-Organic Diamondoid Networks.

Reactions of Cd(NO(3))(2).4H(2)O with 4-cyanopyridine in the presence of ethanol or pyrazine guest molecules under hydro(solvo)thermal conditions afford two new cadmium coordination polymers, [Cd(isonicotinate)(2)(EtOH)][EtOH], 1, and [Cd(isonicotinate)(2)(H(2)O)][pyrazine], 2. The Cd centers in both 1 and 2 are seven-coordinate with distorted pentagonal bipyrimidal structures via coordination to two pyridyl nitrogen atoms, one oxygen atom from a solvent molecule, one chelating carboxylate, and one semichelating carboxylate group. The bridging isonicotinate groups link each Cd center to four adjacent Cd centers, resulting in three-dimensional polymeric networks based on doubly interpenetrated diamondoid structures. One molecule of ethanol or pyrazine is also included in 1 or 2, respectively, to fill the void space left within the solid after the twofold interpenetration. Thermogravimetric analyses (TGA) showed that the included and coordinated ethanol molecules in 1 could be removed stepwise at 100 and 160 degrees C, respectively. After the removal of the guest ethanol molecules, the resulting nanoporous solid exhibits the same X-ray powder diffraction (XRPD) pattern as 1. Guest ethanol molecules can be reintroduced into the evacuated sample of 1 via exposure to ethanol vapor at room temperature. Further heating results in the loss of coordinated ethanol molecules and the collapse of the polymeric network structure. On the other hand, XRPD shows that removal of pyrazine in 2 is accompanied by the loss of the coordinated water molecules and, consequently, the collapse of the polymeric network structure. These results demonstrate that nanopores can be designed based on interpenetrated coordinated networks. Crystal data for 1: orthorhombic space group Pbca, a = 12.691(1) Å, b = 15.545(1) Å, c = 18.342(1) Å, and Z = 8. Crystal data for 2: orthorhombic space group Pbca, a = 12.081(1) Å, b = 15.323(2) Å, c = 19.705(3) Å, and Z = 8.

Solid-state photosolvolysis of clathrate crystals including ethanol as a guest component

The guest ethanol molecules in the clathrate crystals reacted photochemically with the diol host compounds, bis(9-hydroxyfluoren-9-yl)thieno[3,2-b]- and [2,3-b]-thiophenes, to cause photosubstitutions in the solid-state.