Hong-Yan Mao

Synthesis and crystal structures of Cu(II) and Pb(II) aroylhydrazone complexes and magnetic properties of [Cu2(L)2(Cl)2(HO)6] n (HL=2-pyridylaldehyde isonicotinoylhydrazone)

Two novel aroylhydrazones complexes {[Cu2(L)2(Cl)2](H2O)6} n (1), [Pb(L)(CH3COO)] (2), (HL = 2-pyridylaldehyde isonicotinoylhydrazone), were synthesized and structurally characterized by means of X-ray single-crystal diffraction. In complex 1, HL coordinates to Cu(II) using the normal coordination of aroylhydrazone, and also two pyridyl nitrogens forming a coordination polymer. There are strong intermolecular π–π stacking interactions in 2. Magnetism of complex 1 was studied in the temperature range 5–300 K. The results reveal the occurrence of a weak ferromagnetic coupling with J = 0.29 cm−1.

Synthesis and Crystal Structure of a Novel Supra‐Molecular Compound [Co(tsc)2][NPA]2 · 4H2O (tsc=Thiosemicarbazide, H2NPA=3‐Nitro‐Phthalic Acid)

The supramolecular compound [Co(tsc)2][NPA]2 · 4H2O has been synthesized, with its crystal structure characterized by IR spectrum and X‐ray crystallography diffraction. It belongs to triclinic crystal with p‐1 space group. Unit cell dimensions are a=6.6585(13) Å, b=6.6585(13) Å, c=13.871(3) Å; α=86.64(3)°, β=89.78(3)°, γ=75.42(3)°, V=717.9(2) Å3. Characterization reveals that 3‐nitro‐hphthalate anions as hydrogen bond acceptor bonds to two different cations in parallel and vertical directions, respectively. All of the potential hydrogen bond donors and acceptors are involved in hydrogen bonds, leading to a 2D supramolecular layer structure.

A Unique μ‐dichloro‐Bridged Butterfly‐shaped Dimer: Synthesis and Crystal Structure of [Cu(bpmh)Cl2]2 (bpmh=2,2′‐bipyridyl‐3‐carbomethoxy‐3′‐formylhydrazine), Roles of π–π Interaction and Steric Hindrance Effect in Crystal Packing

The title complex, [Cu(bpmh)Cl2]2, was formed from Cu(II) with 2,2′‐bipyridyl‐3‐ carbomethoxy‐3′‐formyhydrazine (bpmh), by‐product of the reaction of 2,2′‐bipyridyl‐3,3′‐dicarbomethoxy (bpdc) with hydrazine hydrate, during the preparation of the copper(II) complex of bpdh (bpdh=2,2′‐bipyridyl‐3,3′‐diformylhydrazine) in acetone. The structure of [Cu(bpmh)Cl2]2 has been determined by X‐ray diffraction analysis as a μ‐dichloro‐bridged, butterfly‐shaped dimer. The dimer unit, [Cu(bpmh)Cl2]2, crystallizes in the monoclinic space group C2/c. The geometry of the copper centers is tetragonal‐pyramidal with two chlorine atoms and two pyridine nitrogen atoms in the base and one bridged chlorine atom at the apex. The values of the bridging angle, out‐of‐plane Cu(1B)‐Cl(2A) distance, and Cu(1)‐Cu(1A) separation are 87.7°, 2.881 Å and 3.584 Å, respectively. The crystal packing pattern of [Cu(bpmh)Cl2]2 is influenced by π−π interaction and steric hindrance.

Synthesis, Crystal Structures of Y(III) and Ni(II) Aroylhydrazones Complexes and π–π Interactions in the Crystal

Two novel aroylhydrazone complexes [Y(HL1)4(H2O)4](NO3)3(MeOH)6 1, [Ni(HL2)SO4](H2O)6 2, (HL1=4,5-diazafluorene-9-one isonicotinoylhydrazoneand HL2=2-pyridylaldehyde furoylhydrazone) were synthesized and structurally characterized by means of X-ray single-crystal diffraction. There are strong intermolecular π–π stacking interactions in the complexes 1 and 2, especially complex 1 was stabilized by the intermolecular and intramolecular π–π stacking interactions.

Crystal Structures and Electrochemical Property of Two Novel Complexes [Cu(o‐phth)(H2O)]n and [Co(3‐nitro‐phth)(4,4′‐bipy)2(H2O)3]n

A copper(II) complex with o‐phthalate acid [Cu(o‐phth)(H2O)]n (1) and a cobalt(II) complex with 3‐nitro‐phthalic acid and 4,4′‐bipyridine [Co(3‐nitro‐phth) (4,4′‐bipy)2(H2O)3]n (2) have been synthesized. These two novel complexes were characterized by IR, X‐ray crystallography diffraction. Complex 1 belongs to monoclinic crystal with C2 (1)/c space group, the complex 2 triclinic crystal with P‐1. Also, electrochemical properties of these complexes and thermal decomposition process of complex 1 were investigated.

CCDC 217022: Experimental Crystal Structure Determination

Related Article: Hong-Lei Liu, Hong-Yan Mao, Hong-Yun Zhang, Chen Xu, Qing-An Wu, Gang Li, Yu Zhu, Hong-Wei Hou|2004|Polyhedron|23|943|doi:10.1016/j.poly.2003.11.059