Baolong Li

Crystal structure of a cyanide-bridged heptanuclear manganese(III)–chromium(III) complex with a ground state S = 21/2

K3[Cr(CN)6] reacts with the mononuclear MnIII complex Mn(salen)ClO4 · 2H2O [salen: N,N′-ethylenebis(salicylideneiminato)dianion] to give a bimetallic heptanuclear complex cation salt [Cr{(CN)Mn(salen · H2O)}6][Cr(CN)6]6H2O. In the complex anion, [Cr{(CN)Mn(salen · H2O)}6]3+, six MnIII ions coordinate to a CrIII center via cyano bridges, forming a spherical species with 3 symmetry. A study of magnetic properties shows the presence of antiferromagnetic interaction through the cyanide bridge between CrIII (S = 3/2) and MnIII (S = 4/2) and results in a ground state S = 21/2.

One-dimensional chain copper complexes [Cu(dien)(btrz)(ClO4)2] and [Cu(en)2(btrz)(ClO4)2] based on the bridging ligand 1,2-bis(1,2,4-triazole-1-yl)ethane (btrz)

The reaction of diethylenetriamine (dien) and 1,2-bis(1,2,4-triazole-1-yl)ethane (btrz) with Cu(ClO4) · 6H2O forms [Cu(dien)(btrz)(ClO4)2] (1), and the reaction of [Cu(en)2(ClO4)2] (en = ethylenediamine) with btrz forms [Cu(en)2(btrz)(ClO4)2] (2). Complexes (1) and (2) were characterized by elemental analysis, i.r., electronic spectroscopy, e.s.r. and magnetic susceptibility. Their crystal structure was determined by X-ray diffraction. In complex (1), Cu is coordinated by a dien and two btrz, forming a distorted CuN5 square pyramid with one btrz bound at the apical position. In complex (2), Cu is coordinated by two en and two nitrogen atoms of btrz forming an elongated octahedron. Both complexes have a one-dimensional chain structure in which btrz ligands bridge between pairs of Cu atom.

Syntheses and structures of three new coordination polymers with the flexible 1,2-bis(1,2,4-triazol-1-yl)ethane ligand

Three new coordination polymers {[Ni(bte)2(NCO)2](H2O)} n (1), {[Ni(bte)2(N3)2](H2O)} n (2) and {[Ag(bte)2](NO3)} n (3) (bte = 1,2-bis(1,2,4-triazol-1-yl)ethane) were synthesized and characterized by X-ray crystallography, IR and thermogravimetric analysis. The coordination geometry of the Ni(II) atom is distorted octahedral, coordinated equatorially by four nitrogen atoms from four triazole rings of four symmetry-related bte ligands, and axially by two nitrogen atoms from two isocyanate anions in 1 and azide anions in 2, respectively. The structures of 1 and 2 are both polymeric, with 18-membered spiro-fused rings and each 18-membered ring involving two inversion-related bte molecules. The coordination geometry of the Ag(I) atom in 3 is distorted tetrahedral, formed by four nitrogen atoms from four triazole rings of four symmetry-related bte ligands. Each bte ligand links two Ag(I) atoms and forms a two-dimensional undulated (4,4) network in 3.

A novel three-dimensional coordination polymer [Cd2(C3H2O4)2(H2O)2(μ2-hmt)]n (hmt = hexamethylenetetramine): synthesis and crystal structure

The self-assembly of the CdII ion, hexamethylenetetramine (hmt) and malonate ligand yields a three-dimensional (3D) coordination polymer [Cd2(C3H2O4)2(H2O)2(μ2-hmt)]n with channels. The CdII ion is located in a octahedral coordination environment, composed of four oxygen atoms from three malonates, one oxygen atom of water and one nitrogen atom of hmt. Two oxygen atoms of each malonate coordinate to the same CdII ion and the other two oxygen atoms connect to adjacent two CdII ions respectively to form a two-dimensional infinite network, these networks are bridged by μ2-hmt coordinated to CdII ions to product a 3D architecture.

Synthesis, Crystal Structure and Magnetic Property of [Mn2(mal)2(H2O)2(µ2-hmt)] n : A Novel Three-Dimensional Network Self-Assembled by hmt (hmt = Hexamethylenetetramine and mal = Malonate)

A novel three-dimensional coordination polymer [Mn2(mal)2(H2O)2(μ2-hmt)] n (hmt = hexamethylenetetramine, and mal = malonate) was synthesized and characterized by elemental analysis, crystal structure, IR, TG-DTA and magnetic susceptibility. The compound [Mn2(mal)2(H2O)2(μ2-hmt)] n crystallizes in the orthorhombic system, space group 12 mm, with a = 7.1059(11), b = 7.6986(6), c = 15.9824(13) Å, and Z = 2. Mn(II) ion has octahedral geometry coordinated by four oxygen atoms from three malonate, one oxygen atom of water and one nitrogen atom of hmt ligand. The two oxygen atoms of each malonate coordinate to the same Mn(II) ion and the other two oxygen atoms connect to two adjacent Mn(II) ions to form an infinite layer. These layers are bridged by the μ2-hmt ligands to form a three-dimensional structure. The magnetic susceptibility data show that there is an antiferromagnetic exchange interaction in the title compound.

Synthesis, Structure and Characterization of the Cyano-Bridged Heteropolymer Poly{[Bis(Trimethylenediamine)Copper(II)][Hexacyanocobalt(III)]} Perchlorate Dihydrate with a Two-Dimensional Framework

The complex [Cu(tn)2]2[Co(CN)6](ClO4)·2H2O (tn = trimethylenediamine) has been prepared and characterized by elemental analysis, IR, electronic and electronic spin resonance spectra and magnetic properties. The x-ray structure analysis shows that each [Co(CN)6]3− ion coordinates to four [Cu(tn)2]2+ cations through four cyano nitrogen atoms in the same plane, providing a two-dimensional square network structure, formed from Co-CN-Cu(tn)2-NC-Co linkages.

Synthesis and crystal structure of [Ag2(μ4-hmt)(NO2)2]n. A two-dimensional network with square cavities self-assembled by hmt (hmt = Hexamethylenetetramine)

AgNO2 (1 mol) reacts with hexamethylenetetramine (hmt) (1 mol) in MeCN–H2O to yield a two-dimensional coordination polymer [Ag2(μ4-hmt)(NO2)2]n with square cavities. The Ag2 atom is located in a linear structure coordination environment with two nitrogen atoms from two hmt molecules respectively. The Ag1 atom is coordinated in a triangular prism surrounded by two nitrogen atoms from two hmt molecules respectively and four oxygen atoms from two NO−2 ions respectively. The four nitrogen atoms of each hmt unit are all connected to AgI to form a two-dimensional network.

Synthesis, structure and luminescent properties of a new two-dimensional (4,4) network cadmium coordination polymer with dicyanamide and benzimidazole ligands

The new cadmium coordination polymer [Cd(bim)2(dca)2]n (1), (bim = benzimidazole, dca = dicyanamide) was synthesized and characterized by IR, thermogravimetric analysis and luminescent properties. The coordination geometry of cadmium atom is distorted octahedral, coordinated equatorially by four nitrogen atoms from four dicyanamide ligands, and axially by two nitrogen atoms from two benzoimidazoles. Each dca ligand links two cadmium(II) atoms and 1 forms a two-dimensional (4,4) network.

Template self-assembly of cyano-bridged supramolecular complexes {[Cu(en)2][KM(CN)6]} n (M = CrIII, FeIII, CoIII)

Reaction of K3[M(CN)6] (M = CrIII, FeIII, CoIII ) with [Cu(en)2](ClO4)2 in water gives three cyanide-bridged supramolecular complexes, {[Cu(en)2][KM(CN)6]} n [M = CrIII (1), FeIII (2), CoIII (3); en = ethylenediamine], which have been characterized by elemental analysis, ICP analysis, IR spectra, TGA-DTA analysis and X-ray diffraction. Complex 1 crystallizes in the monoclinic, space group C2/c with cell dimensions a = 0.85237(12), b = 1.7014(3), c = 1.2103(2) nm, β  = 98.70(2)° and Z = 4, and 2 crystallizes in the same space group with a = 0.8401(2), b = 1.6844(5) Å, c = 1.1859(2) nm, β  = 98.98(2)° and Z = 4. The crystal structures of 1 and 2 reveal a novel three-dimensional porous framework in which [Cu(en)2]2+ acts as a template, [M(CN)6]3− as a building block and K+ as a connecting unit.

Syntheses and structures of two new uranyl complexes [UO2(DPDPU)2(NO3)2](C6H5CH3) and [UO2(PMBP)2(DPDPU)](CH3C6H4CH3)0.5

Two new uranyl complexes [UO2(DPDPU)2(NO3)2](C6H5CH3) (1) and [UO2(PMBP)2 (DPDPU)](CH3C6H4CH3)0.5 (2), (DPDPU = N,N′-dipropyl-N,N′-diphenylurea, HPMBP = 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5) were synthesized and characterized. The coordination geometry of the uranyl atom in 1 is distorted hexagonal bipyramidal, coordinated by two oxygen atoms of two DPDPU molecules and four oxygen atoms of two bidentate nitrate groups. The coordination geometry of the uranyl atom in 2 is distorted pentagonal bipyramidal, coordinated by one oxygen atom of one DPDPU molecule and four oxygen atoms of two chelating PMBP molecules.