Jingli Xie

Complicated magnetic behavior in one-dimensional nickel(III) chain complex [1-(4′-cyanobenzyl)pyridinium][Ni(mnt)2](mnt2−=maleonitriledithiolate)

Abstract A new ion-pair complex [1-(4′-cyanobenzyl)pyridinium] [Ni(mnt)2] (1), in which mnt2−=maleonitriledithiolate, have been fabricated and its X-ray single crystal structural analyses at 293, 180 and 140 K shown that the [Ni(mnt)2]− anions and [CNBzPy]+ cations form a well-separated stacking column along c-axis direction, within which [Ni(mnt)2]− anions are uniformly spaced to give a one-dimensional (1-D) chain structure. Bulk magnetic properties of this complex have been investigated in the temperature range of 2–400 K and shown there exists spin kink at ∼190 K. In low temperature region, weak ferromagnetic behavior occurs in 1.

Syntheses and crystal structures of two new nickel 1,2,5-thiadiazole-3, 4-dithiolate complexes as benzylpyridinium salts

Two new complexes, [BrBzPy]2[Ni(tdas)2] (1) and [BrFBzPy]2[Ni(tdas)2] (2), have been prepared by reaction of disodium 1,2,5-thiadiazole-3,4-dithiolate (Na2tdas), NiCl2·6H2O and 1-(4′-bromobenzyl) pyridinium bromide (BrBzPyBr) or 1-(4′-bromo-2′-fluorobenzyl)pyridinium) bromide (BrFBzPyBr). Crystallographic data for 1: monoclinic, P21 /c, a = 11.333(1), b = 12.602(1), c = 12.267(1) Å, β = 115.65(1)°, V = 1579.4(18) Å3, Z = 4. Data for 2: triclinic, , a = 7.437(2), b = 10.382(2), c = 11.330(2) Å, α = 110.07(3), β = 92.58(3), γ = 93.32(3)°, V = 818.5(2) Å3, Z = 1. In the complexes, the [Ni(tdas)2]2− anion exhibits a quasi-planar structure. The topology of the countercation results in different stacks of molecules in the complexes.

New ion-pair nickel(III) complexes containing [Ni(‘S2’)2] (‘S2’2−=1,2-benzenedithiolate) fragments: synthesis, crystal structure and properties

Abstract Two new ion-pair complexes [1-(4′-fluorobenzyl)pyridinium][Ni(bdt) 2 ] ( 1 ) and [1-(4′-bromobenzyl)pyridinium][Ni(bdt) 2 ] ( 2 ), in which bdt 2− =1,2-benzenedithiolate (‘S 2 ’ 2− ), have been prepared and characterized. X-ray structural analyses showed that 1 and 2 are isostructural, and the anions are centrosymmetric. The 2 non-equiv. anions form different uniform-spaced stacking pattern in 1 and 2 . The magnetic measurements of 1 and 2 indicate ferromagnetic behavior in the antiferromagnetic exchange system, which may arise from spin canting. Cyclovoltammetry revealed two quasi-reversible one-electron steps for 1 and 2 , which are attributed to Ni(IV/III) and Ni(III/II) redox couples.

A novel molecular ladder structure of Cu(II)–Ba(II) coordination polymer exhibiting ferromagnetic coupling

A novel one-dimensional ladder-like Cu-Ba compound ([Ba(H2O)3(CuL)2] x 2H2O)n (H3L = Glycylglycine, N-[1-(2-hydroxyphenyl)propylidene]), has been synthesized and structurally characterized; it exhibits ferromagnetic interaction.

Synthesis, crystal structure and magnetic properties of a novel one-dimensional nickel(III) chain complex showing ferromagnetic ordering at low temperature

A novel ferromagnetic complex [BrFBzPy][Ni(mnt)2], where [BrFBzPy]+ = 1-(4′-bromo-2′-fluorobenzyl)pyridinium and mnt2− = maleonitriledithiolate, has been prepared and characterized. In the crystal structure the most prominent feature is that the [Ni(mnt)2]− anions and [BrFBzPy]+ cations form a well-separated stacking column along the c-axis, within which the [Ni(mnt)2]− anions are uniformly spaced to give a one-dimensional (1-D) chain structure. The magnetic properties of this complex have been investigated in the temperature range 1.8–300 K and its magnetization studies show there exists ferromagnetically coupled interactions within the [Ni(mnt)2]− anion chain (J = 42.2 cm−1), and antiferromagnetically coupled interactions between [Ni(mnt)2]− anion chains (Jeff = −4.78cm−1). The temperature dependences of the ac susceptibility revealed that this 1-D chain system is ferromagnetically ordered around 2 K and χac measurements performed at different magnetic fields and frequencies suggest that there may coexist a degree of spin glass behaviour at low temperature.

Synthesis and crystal structure of metal complexes of Schiff bases derived from Glycylglycine and Salicylaldehyde [Ni(H2O)6(Ml)2]·nH2O (M = Cu, Ni; L = C11H9N2O4)

Complexes [Ni(H2O)6(ML)2]·nH2O (M = Cu, Ni; L = Schiff base derived from glycylglycine and salicylaldehyde, C11H9N2O4) were synthesized and characterized. The [Ni(H2O)6(CuL)2]·10H2O complex 1 crystallized in the space group , with a = 7.217(1), b = 11.674(1), c = 12.678(1) Å, α = 66.56(1), β = 76.60(1), γ = 80.46(1)°, and Z = 1. The [Ni(H2O)6(NiL)2]·2H2O complex 2 crystallized in the group P2(1)/c, with a = 10.564(2), b = 20.246(4), c = 6.965(2) Å, β = 103.14(1)°, and Z = 2. Hydrogen bonding involving [ML]−, Ni(H2O)6 2+ and molecular water forms a three-dimensional (3D) supermolecule. The determination of variable-temperature magnetic susceptibilities indicates an antiferromagnetic interaction between the metallic atoms of 1, and a corresponding ferromagnetic interaction for 2.

Intramolecular photo-substitution in the inclusion compound of mono[6-deoxy-6-(2-aminoethyl thio-1,2-dicyane ethylenylthio)]-β-cyclodextrin with cyclopentadienyl manganese tricarbonyl in DMF solution

Abstract A novel host of β-cyclodextrin (β-CD) derivative, mono[6-deoxy-6-(2-aminoethyl thio-1,2-dicyane ethylenylthio)]-β-CD ( 3 ), and its inclusion compound 4 with cyclopentadienyl manganese tricarbonyl (CpMn I (CO) 3 ) have been prepared and characterized by spectroscopic methods. It is experimentally evident that the inclusion complexation stabilized the guest extremely when complex 4 was heated. Upon irradiation of inclusion compound 4 in DMF solution, an interesting intramolecular photo-substitution resulting in the formation of a self-stabilized compound mono[6-deoxy-6-(2-aminoethyl thio-1,2-dicyane ethylenylthio)]-β-CDMn II Cp(DMF) 2 ( 7 ) was observed. Based upon a double-recognition between the host and the organometallic guest, compound 7 became very stable in DMF solution.

[Ba(H2O)4(CuL)2]n: a novel coordination polymer constructed from L-bridged 1D chains via inter-chain hydrogen bonds (L=Schiff base derived from 5-bromosalicylaldehyde and glycylglycine)

Abstract A novel coordination polymer [Ba(H 2 O) 4 (CuL) 2 ] n (where L=Schiff base derived from 5-bromosalicylaldehyde and glycylglycine) has been synthesized and characterized by X-ray crystallography. The structure reveals the formation of one-dimensional chains, which are assembled further into two-dimensional network by hydrogen bonds between the coordinated water molecules.

Organoselenium-catalyzed vicinal dichlorination of unsaturated phosphonates

Diphenyl diselenide (PhSeSePh) was effective as a pre-catalyst for the vicinal dichlorination of α,β-unsaturated phosphonates with sulfuryl chloride. The reaction conditions were mild and the desired products were formed in up to 93% yield and moderate diastereoselectivity (10 : 1). The important diphenylselenium dichloride intermediate was obtained and characterized by X-ray crystallography.

Syntheses and crystal structures of two maleonitriledithiolate complexes containing the 1-(R-benzyl)pyrazinium cation (R = 4′-nitro or 4′-bromo)

The complexes [NO2BzPz]2[Ni(mnt)2] (1) and [BrBzPz]2[Pd(mnt)2] (2) have been prepared by reaction of Na2mnt, NiCl2·6H2O or PdCl2, and the corresponding 1-(R-benzyl)pyrazinium bromide salt (R = 4′-nitro, R = 4′-bromo). Crystallographic data for 1: monoclinic, P21/n, a = 7.3494(15), b = 15.223(3), c = 15.054(3) Å, β = 102.42(3)°, V = 1644.8(6) Å3, Z = 2. Data for 2: monoclinic, P21/n, a = 7.399(2), b = 19.024(4), c = 12.224(2) Å, β = 94.62(3)°, V = 1715.0(7) Å3, Z = 4. In both complexes, the [M(mnt)2]2− anion has a centre of symmetry at the metal atom and two cations are related to each other by the symmetry centre. The [M(mnt)2]2− anion exhibits a quasi-planar structure in both complexes, which show similar crystal packing.