Coordination-directed one-dimensional coordination polymers generated from a new oxadiazole bridging ligand and HgX2 (X=Cl, Br and I).

A new 1,3,4-oxadiazole bridging bent organic ligand, 2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole, C(28)H(24)N(4)O(3), L, has been used to create three novel one-dimensional isomorphic coordination polymers, viz. catena-poly[[[dichloridomercury(II)]-μ-2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole] methanol monosolvate], {[HgCl(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n), catena-poly[[[dibromidomercury(II)]-μ-2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole] methanol monosolvate], {[HgBr(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n), and catena-poly[[[diiodidomercury(II)]-μ-2,5-bis{5-methyl-2-[(4-pyridyl)methoxy]phenyl}-1,3,4-oxadiazole] methanol monosolvate], {[HgI(2)(C(28)H(24)N(4)O(3))]·CH(3)OH}(n). The free L ligand itself adopts a cis conformation, with the two terminal pyridine rings and the central oxadiazole ring almost coplanar [dihedral angles = 5.

Bis(μ-2-{5-[(pyridin-4-ylmethyl)sulfanyl]-1,3,4-oxadiazol-2-yl}phenolato)bis[(acetylacetonato)copper(II)]: a novel binuclear metallocycle.

The new asymmetric ligand 2-{5-[(pyridin-4-ylmethyl)sulfanyl]-1,3,4-oxadiazol-3-yl}phenol (HL) has been used to synthesize the novel discrete title binuclear metallocycle, [Cu(2)(C(14)H(10)N(3)O(2)S)(2)(C(5)H(7)O(2))(2)] or Cu(2)L(2)(acac)(2) (acac is acetylacetonate). Each Cu(II) centre is five-coordinate and adopts a square-pyramidal geometry. Two ligands are connected by two Cu(II) cations to form the dinuclear metallocycle, which lies across a crystallographic inversion centre.

Two threefold interpenetrated two-dimensional frameworks based on a flexible imidazole-containing ligand and benzene-1,4-dicarboxylate.

The open-chain polyether-bridged flexible ligand 1,2-bis[2-(1H-1,3-imidazol-1-ylmethyl)phenoxy]ethane (L) has been used to create two two-dimensional coordination polymers under hydrothermal reaction of L with Cd(II) or Co(II), in the presence of benzene-1,4-dicarboxylic acid (H(2)bdc). In poly[[(μ(2)-benzene-1,4-dicarboxylato){μ-1,2-bis[2-(1H-1,3-imidazol-1-ylmethyl)phenoxy]ethane}cadmium(II)] dihydrate], {[Cd(C(8)H(4)O(4))(C(22)H(22)N(4)O(2))]·2H(2)O}(n), (I), and the cobalt(II) analogue {[Co(C(8)H(4)O(4))(C(22)H(22)N(4)O(2))]·2H(2)O}(n), (II), the Cd(II) and Co(II) cations are six-coordinated by four carboxylate O atoms from two different bdc(2-) dianions in a chelating mode and two N atoms from two distinct L ligands. The metal ions, bdc(2-) dianions and L ligands each sit across crystallographic twofold axes.

Synthesis and characterization of new coordination polymers with tunable luminescent properties generated from bent 1,2,4-triazole-bridged N,N'-dioxides and Ln(III) salts.

A new bent 1,2,4-triazole-bridged N,N'-dioxide ligand, namely, 3,5-bis(3-pyridyl-N-oxide)-4-amino-1,2,4-triazole (L2), was designed and synthesized by the oxidation of 3,5-bis(3-pyridyl)-4-amino-1,2,4-triazole with H(2)O(2) in the presence of HOAc at ambient temperatures. Eleven Ln(III)-based coordination polymers have been successfully prepared by the solution reactions of L2 with various Ln(III)-perchlorates. The structures of these new Ln(III) polymers clearly reflect the effect of the lanthanide contraction.

catena-Poly[[[tetraaquazinc(II)]-mu-4-amino-3,5-di-3-pyridyl-4H-1,2,4-triazole] sulfate monohydrate] and poly[[bis(mu-4-amino-3,5-di-4-pyridyl-4H-1,2,4-triazole)diaquacopper(II)] dinitrate octahydrate].

The isomeric bent triazole-containing ligands 4-amino-3,5-di-3-pyridyl-4H-1,2,4-triazole (L1) and 4-amino-3,5-di-4-pyridyl-4H-1,2,4-triazole (L2) have been used to create the two novel title complexes catena-poly[[[tetraaquazinc(II)]-mu-4-amino-3,5-di-3-pyridyl-4H-1,2,4-triazole] sulfate monohydrate], {[Zn(C(12)H(10)N(6))(H(2)O)(4)]SO(4).H(2)O}(n), (I), and poly[[diaquabis(mu-4-amino-3,5-di-4-pyridyl-4H-1,2,4-triazole)copper(II)] dinitrate octahydrate], {[Cu(C(12)H(10)N(6))(2)(H(2)O)(2)](NO(3))(2).8H(2)O}(n), (II).

Self-inclusion structure of 5,11,17,23-tetrakis(azidomethyl)-25,26,27,28-tetrahydroxycalix[4]arene, and 5,11,17,23-tetra-tert-butyl-25,27-bis(chloroacetoxy)-26,28-bis(2-pyridylmethoxy)calix[4]arene.

In the structures of the two title calix[4]arene derivatives, C(32)H(28)N(12)O(4), (I), and C(60)H(68)Cl(2)N(2)O(6), (II), compound (I) adopts an open-cone conformation in which there are four intramolecular O-H...

Cocrystallization of two tautomers: 4-(1-{[4-(dimethylamino)benzylidene]hydrazono}ethyl)benzene-1,3-diol and 6-[(E)-1-{[4-(dimethylamino)benzylidene]hydrazino}ethylidene]-3-hydroxycyclohexa-2,4-dien-1-one (1/1).

Two different tautomeric forms of a new Schiff base, C(17)H(19)N(3)O(2).C(17)H(19)N(3)O(2), are present in the crystal in a 1:1 ratio, namely the enol-imine form 4-(1-{[4-(dimethylamino)benzylidene]hydrazono}ethyl)benzene-1,3-diol and the keto-amine form 6-[(E)-1-{[4-(dimethylamino)benzylidene]hydrazino}ethylidene]-3-hydroxycyclohexa-2,4-dien-1-one. The tautomers are formed by proton transfer between the hydroxy O atom and the imine N atom and are hydrogen bonded to each other to form a one-dimensional zigzag chain along the crystallographic b axis via intermolecular hydrogen bonds.

A novel three-dimensional framework constructed by 2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole and infinite chains of hydrogen-bonded water molecules.

A novel three-dimensional framework of 2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole dihydrate, C(11)H(10)N(4).2H(2)O or L.2H(2)O, (I), in which L acts as both hydrogen-bond acceptor and donor in the supramolecular construction with water, has been obtained by self-assembly reaction of L with H(2)O.

Two bicyclic dinuclear complexes generated from 3,3'-[1,3,4-thiadiazole-2,5-diyldi(thiomethylene)]dibenzoic acid (L) and dimethylformamide (DMF): [Cu(L)(DMF)]2and [Zn(L)(DMF)]2.

A new 1,3,4-thiadiazole bridging ligand, namely 3,3'-[1,3,4-thiadiazole-2,5-diyldi(thiomethylene)]dibenzoic acid (L), has been used to create the novel isomorphous complexes bis{mu-3,3'-[1,3,4-thiadiazole-2,5-diyldi(thiomethylene)]dibenzoato}bis[(N,N-dimethylformamide)copper(II)], [Cu(2)(C(18)H(12)N(2)O(4)S(3))(2)(C(3)H(7)NO)(2)], (I), and bis{mu-3,3'-[1,3,4-thiadiazole-2,5-diyldi(thiomethylene)]dibenzoato}bis[(N,N-dimethylformamide)zinc(II)], [Zn(2)(C(18)H(12)N(2)O(4)S(3))(2)(C(3)H(7)NO)(2)], (II). Both exist as centrosymmetric bicyclic dimers constructed through the syn-syn bidentate bridging mode of the carboxylate groups. The two rings share a metal-metal bond and each of the metal atoms possesses a square-pyramidal geometry capped by the dimethylformamide molecule.

A novel two-dimensional framework based on unprecedented cadmium(II) chains.

The bent ligand 4-[(1H-1,2,4-triazol-1-yl)methyl]benzoic acid (HL) has been used to create the novel two-dimensional coordination polymer poly[mu(2)-aqua-mu(2)-chlorido-{mu(2)-4-[(1H-1,2,4-triazol-1-yl)methyl]benzoato}cadmium(II)], [Cd(C(10)H(8)N(3)O(2))Cl(H(2)O)](n), under hydrothermal reaction of HL with cadmium chloride. The crystallographically unique Cd atom is seven-coordinated in an approximately pentagonal-bipyramidal environment of two carboxylate O atoms, two water O atoms, two Cl atoms and one triazole N atom. A notable feature is the presence of zigzag .

A two-dimensional network formed by self-associating silver(I) perchlorate with 3-[4-(2-thienyl)-2H-cyclopenta[d]pyridazin-1-yl]benzonitrile.

In the organometallic silver(I) supramolecular complex poly[[silver(I)-mu(3)-3-[4-(2-thienyl)-2H-cyclopenta[d]pyridazin-1-yl]benzonitrile] perchlorate methanol solvate], {[Ag(C(18)H(11)N(3)S)](ClO(4)).CH(3)OH}(n), there is only one type of Ag(I) center, which lies in an {AgN(2)Spi} coordination environment. Two unsymmetric multidentate 3-[4-(2-thienyl)-2H-cyclopenta[d]pyridazin-1-yl]benzonitrile (L) ligands link two Ag(I) atoms through pi-Ag(I) interactions into an organometallic box-like unit, from which two 3-cyanobenzoyl arms stretch out in opposite directions and bind two Ag(I) atoms from neighboring box-like building blocks.

A binuclear Cu(II) metallacycle capable of discerning between pyrazine and its different methyl-substituted derivatives based on reversible intracage metal-ligand binding.

Squashy cage: A flexible, spongelike, and reversible metal-binding Cu(2)L(2) cage that can adjust its internal space in response to pyrazine and its derivatives based on a recognition sequence of pyrazine, 2,5-dimethylpyrazine, and 2-methylpyrazine (see figure) is described.

3,5-Bis(4-methoxy-phen-yl)-1H-1,2,4-triazole monohydrate.

In the title compound, C(16)H(15)N(3)O(2)·H(2)O, the two benzene rings and the triazole ring lie almost in the same plane, the triazole ring forming dihedral angles of 5.07 (9) and 5.80 (8)° with the benzene rings.

4-[5-(4-Pyrid-yl)-1,3,4-oxadiazol-2-yl]pyridine N-oxide-isophthalic acid (1/1).

The title compound, C(12)H(8)N(4)O(2)·C(8)H(6)O(4), was synthesized from 4-[5-(4-pyrid-yl)-1,3,4-oxadiazol-2-yl]pyridine N-oxide and isophthalic acid. The two mol-ecules are linked through O-H⋯O and O-H⋯N hydrogen bonds. Weak intra-molecular π-π inter-actions between the two hydrogen-bonded chains result in the formation a one-dimensional supra-molecular curved tape (the face-to-face distance between the pyridine N-oxide ring and the benzene ring is 3.

Bis{μ-2,5-bis-[4-(2-pyridylmethyl-amino)phen-yl]-1,3,4-oxadiazole}bis-[dichlorido-mercury(II)].

In the title centrosymmetric compound, [Hg(2)Cl(4)(C(26)H(22)N(6)O)(2)], each Hg(II) center adopts a distorted HgN(3)Cl(2) trigonal bipyramidal coordination geometry, formed by two pyridine N atoms, one imine N atom and two chloride anions. Within the organic ligand, the oxadiazole ring is nearly coplanar with the two benzene rings [dihedral angles = 5.9 (4) and 6.

Ag(I) and Cu(II) discrete and polymeric complexes based on single- and double-armed oxadiazole-bridging organic clips.

Four new oxadiazole-bridging ligands (L1-L4) were designed and synthesized by the reaction of 2,5-bis(2-hydroxyphenyl)-1,3,4-oxadiazole with isonicotinoyl chloride and nicotinoyl chloride, respectively. L1 and L3 are unsymmetric single-armed ligands (4- or 3-pyridinecarboxylate arm), and L2 and L4 are symmetric double-armed ligands (4- or 3-pyridinecarboxylate arms). Nine new complexes, [Ag(L1)]PF6.

A novel cascade supramolecular complex with a reversible nanosized 18-component H-bonded {(C6H6)6(SbF6)12}12- cage unit templated by a chiral metal-organic complex.

A novel cascade supramolecular complex [Ag(L)](SbF6).C6H6 with a reversible nanosized {(C6H6)6(SbF6)12}12- H-bonded cage unit was reported.

Silver(I) coordination polymers based on a nano-sized bent bis(3-acetylenylphenyl-(4-cyanophenyl))oxadiazole ligand: the role of ligand isomerism and the templating effect of polyatomic anions and solvent intermediates.

One nanosized oxadiazole bridging ligand, bis(3-acetylenylphenyl-(4-cyanophenyl))oxadiazole (L11), was designed and synthesized by the reaction of bis(3-iodophenyl)oxadiazole with 4-cyanophenylacetylene via a Sonogashira-Hagihara cross-coupling reaction. Eight Ag(I)-L11 coordination polymers with one-, two-, or three-dimensional structures have been successfully prepared by the reaction of L11 with various Ag(I) salts in solution. New coordination polymers were fully characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction.

Organometallic coordination polymers generated from bent Bis(acetylenylphenyl)oxadiazole ligands and Ag(I) salts.

Two new bent oxadiazole bridging benzoacetylene ligands 2,5-bis(4-ethynylphenyl)-1,3,4-oxadiazole (L9) and 2,5-bis(3-ethynylphenyl)-1,3,4-oxadiazole (L10) were synthesized. The coordination chemistry of them with various inorganic Ag(I) salts has been investigated. Seven new coordination polymers were prepared by solution reactions and fully characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction.

Spontaneously resolved chiral three-fold interpenetrating diamondoidlike Cu(II) coordination polymers with temperature-driven crystal-to-crystal transformation.

The chiral 3-fold interpenetrating diamondoidlike Cu(II)-containing coordination polymer [Cu(2,5-bis(4-pyridyl)-1,3,4-oxadiazole)2(H2O)](ClO4)2]n (1a) is reported. It undergoes a temperature-driven reversible single-crystal-to-single-crystal structural transformation between room- (293 K, 1a) and low-temperature (150 K, 1b) forms.

Synthesis and characterization of new coordination polymers generated from bent bis(cyanophenyl)oxadiazole ligands and Ag(I) salts.

Two new bent bis(cyanophenyl)oxadiazole ligands, 2,5-bis(4-cyanophenyl)-1,3,4-oxadiazole (L7) and 2,5-bis(3-cyanophenyl)-1,3,4-oxadiazole (L8), were synthesized. The coordination chemistry of these ligands with various Ag(I) salts has been investigated. Seven new coordination polymers, namely, {[Ag(L7)(H2O)]ClO4}n) (1) (triclinic, P1, a = 9.