Chunlin Ni

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.

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.

Crystal structure and spectroscopic properties of a new syn-anti carboxylate-bridged polymeric chain copper(II)–glycylglycine complex

A new polymer complex of copper(II)–glycylglycine {[Cu(glygly)(H2O)][Cu(glygly)(H2O)2]} n ·5nH2O (1) is reported. It crystallizes in the P21/c space group, with a = 14.669(2), b = 9.8480(10), c = 14.053(2) Å, β = 102.730(10)° and Z = 4. Compound 1 consists of [Cu(glygly)(H2O)] n 1D carboxylate-bridged polymeric chains, monomer Cu(glygly)(H2O)2 molecules which form hydrogen-bonded chains and uncoordinated water molecules. In all cases, the geometry around copper(II) is a slightly distorted square pyramid with the water oxygen at the apex of the pyramid. The ESR, UV-Vis and IR spectroscopy of the compound were also studied.

Synthesis and characterization of a dipeptide–copper(II)– 2-aminomethylbenzimidazole ternary complex

A new ternary complex [Cu(glygly)(AMBZ)(H2O)]Cl·H2O (1) (glygly = glycylglycine anion, AMBZ =  2-aminomethylbenzimidazole) has been prepared and characterized by single-crystal X-ray diffractometry and ESR, electronic and IR spectroscopy. The copper(II) ion has a slightly distorted square-pyramidal coordination, being equatorially coordinated by the bidentate 2-aminomethylbenzimidazole and the bidentate glycylglycine anion and axially by a water molecule. The individual complex molecules are hydrogen bonded to their neighbors, forming a polymeric hydrogen-bonded lattice. Spectroscopic data are in accordance with the crystal structure.

Self-assembly of a 1D heterotrimetallic Cu(II)-Sr(II)-Na(I) propeller-like chiral coordination polymer with ferromagnetic interactions

Self-assembly of metalloligand [CuL](-)(H(3)L =N-5-bromosalicylaldehydeglycyl-l-tyrosine) with Sr(2+) and Na(+) results in a 1D micro(2)-carboxylate- and H(2)O-bridged heterotrimetallic chiral coordination polymer [[Na(CuL)(3)Sr(H(2)O)(3)].9H(2)O]](n), which exhibits weak ferromagnetic exchange interactions and optical activity.

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.

Preparation, crystal structure and magnetic properties of a maleonitriledithiolate salt of the 1-methyl-3-benzylimidazolium cation with a novel structural motif

A new ion-pair complex, 1-methyl-3-benzylimidazolium bis(maleonitriledithiolato)nickelate(III), has been synthesized and characterized by IR spectroscopy and X-ray crystallography. The compound crystallizes in the triclinic space group P with a = 13.280(1), b = 14.906(1), c = 17.949 (2) Å, α = 108.02(1), β = 101.55(1), γ = 90.51(1)° and Z = 6. There are three inequivalent [Ni(mnt)2]− anions in the structure of the complex, two of them are stacked along the b axis with an AACC-type repeat unit, the other lies approximately orthogonal to the stack. Anions form three kinds of dimers with short Ni···Ni distances, leading to such strong spin coupling interactions that the complex is diamagnetic.

Synthesis, crystal structure and magnetic property of a maleonitriledithiolate nickel(III) complex containing an ammonium crown ether cation

The synthesis, molecular structure and spectroscopic and magnetic properties of (NH4)2(15-crown-5)3[Ni(mnt)2]2 (mnt = maleonitriledithiolate dianion) are reported. The most notable structural feature of (NH4)2(15-crown-5)3[Ni(mnt)2]2 is that the ions form a stacked structure with well-separated columns along the c and a axes. Variable temperature magnetic susceptibility measurements indicate strong antiferromagnetic interactions in the complex.