Dai-Zheng Liao

Structure and magnetic behaviour of a novel alternating one-dimensional chain compound {[Cu(phen)(μ1,1-N3)]2(μ-ta)}n

Abstract A new one-dimensional alternating chain compound {[Cu(phen)(μ1,1-N3)]2(μ-ta)}n (phen=1,10-phenanthroline, ta=terephthalato dianion) has been prepared and characterised by X-ray crystallography and magnetic measurements. The structure consists of copper chains in which the copper(II) ions are alternatively bridged by terephalato and double end-on azido bridges. In the temperature range 4–300 K, the variable temperature magnetic susceptibility of the title compound can be modelled as a dimeric copper species within which the exchange interaction is ferromagnetic.

A pentanuclear complex derived from manganese(III) Schiff-based complex and hexacyanoferrate(III): synthesis, structure and magnetic properties

Abstract A cyano-bridged MnIII–FeIII complex, [Mn(salpn)(CH3OH)]4·[Fe(CN)6]ClO4·9(H2O), was prepared and characterized. Single crystal X-ray analysis reveals that the complex assumes a cyano-bridged Mn4Fe unit. The magnetic measurement showed this complex exhibiting ferromagnetic behavior.

Two different three-dimensional microporous framework structures in [Mn2(H2O)4{W(CN)8}.4H2O]n and [Mn2(H2O)4{W(CN)8}(OH).2H2O]n

Two novel cyano-bridged heterobimetallic coordination polymers, [Mn2(H2O)4{W(CN)8}·4H2O]n (1) and [Mn2(H2O)4{W(CN)8}(OH)·2H2O]n (2), have been synthesized from [W(CN)8]n− (n=4, 5) building blocks and structurally characterized, where all the CN groups of [W(CN)8]n− are involved in bridging. Both polymers display different open microporous frameworks of the 3D polygonal type exhibiting zeolite-like properties. The 3D framework of 2 is unprecedented. The study of the magnetic properties showed that both polymers exhibit weakly antiferromagnetic interactions between the adjacent Mn ions through the diamagnetic NC–WIV–CN spacer for 1 and between WV and Mn ions for 2.

Heterobinuclear copper(II)–nickel(II) complexes of macrocyclic oxamide with diamines and tetraazacyclam as blocking ligands: synthesis, crystal structure and magnetic properties

Three novel oxamido-bridged heterobinuclear copper(II)–nickel(II) complexes derived from macrocylic oxamido compound with diamines and tetraazacyclam as blocking ligands were synthesized and characterized by IR, ESR and electronic spectra. Their formula is [Cu(L)Ni(en) 2 ](ClO 4 ) 2 ·0.5C 2 H 5 OH·H 2 O ( 1 ), [Cu(L)Ni(tmd) 2 ](ClO 4 ) 2 ·4H 2 O ( 2 ) and [Cu(L)Ni( rac -cth)](ClO 4 ) 2 ·CH 3 OH ( 3 ), where L=1,4,8,11-tetraazacyclotradecanne-2,3-dione, en=1,2-diaminoethande, tmd=1,3-diaminopropane and rac -cth is rac -5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane. The crystal structures of the three complexes have been determined. The structures consist of binuclear units in which the copper(II) ion is in a square-planar environment and linked to the nickel(II) ion via the exo - cis oxygen atoms of the oxamido macrocyclic ligand, with Cu⋯Ni separations of 5.311 ( 1 ), 5.420 ( 2 ) and 5.307 A ( 3 ), respectively. The temperature dependence of the magnetic susceptibility for 1 , 2 and 3 was analyzed by means of the Hamiltonian Ĥ =−2 JŜ Ni Ŝ Cu , leading to J =−52.8, −45.7 and −56.9 cm −1 for 1 , 2 and 3 , respectively.

A new mixed-ligand copper(II) complex containing azide and 1,10-phenanthroline: crystal structure and properties

A new copper complex, [Cu(phen)2N3]ClO4 (phen = 1,10-phenanthroline), has been synthesized and characterized by X-ray single-crystal structure analysis. The copper atom is five-coordinated with four nitrogen atoms of two phens and one nitrogen atom of the azide to form an intermediate coordination geometry distorted from trigonal bipyramidal (TBP) and square pyramidal (SP). The extended three-dimensional structure is formed through π–π interactions and hydrogen bonds. The IR spectrum, electronic spectrum, magnetic properties and ESR spectrum of the title compound have been studied.

Synthesis and structure of a supramolecular octanuclear Cu(II) complex {[Cu(sae)] 4 2CH 3 OH·H 2 O} 2 through both μ -oxo and hydrogen bonds (sae = 2-salicylideneamino-1-ethanol)

Abstract A new supramolecular octanuclear copper(II) complex, {[Cu(sae)]42CH3OH·H2O}2, has been synthesized and structurally characterized. The structure of the complex consists of two tetracopper(II) cubane units related by hydrogen bonds.

A 2-D ladder-type polymer, Mn2(NIT2-thz)2Cl4(H2O)2: synthesis, crystal structure and magnetic properties

Abstract A novel Mn(II)-nitronyl nitroxide-substituted thiazole complex Mn2(NIT2-thz)2Cl4(H2O)2 (NIT2-thz=2-(2′-thiazole)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) was synthesized and characterized structurally and magnetically. It crystallizes in the orthorhombic space group Pbca. The complex has dimeric structure where two manganese ions are doubly bridged by chloride ions. Each manganese ion is in a distorted octahedral environment. The complex molecules were connected as two-dimensional ladder-type structure by the intermolecular interaction. Magnetic measurements show that there are three kinds of antiferromagnetic interactions in the compound.

Synthesis and crystal structure of oxo-bridged dimanganese(III) complex [MnIII(salpn)OH]2(CH3OH)(CH3CN)2

Abstract A dimanganese(III) complex [Mn(salpn)OH]2(CH3OH)(CH3CN)2 (1) has been synthesized and characterized structurally(salpn=N,N′-propanolbis(salcylideneiminato)dianion). The structure consists of centrosymmetric [Mn2(salpn)2(OH)2] molecules with each MnIII ion in a distorted octahedral environment: two nitrogen atoms and two oxygen atoms from the basal plane of Schiff-based ligand and two oxygen atoms from two hydroxides.

A Novel, three-dimensional, Tetrachlorophthalato-bridged Samarium(III) complex [Sm(tcph)2(H2O)6]Hpip·5H2O

A novel, three-dimensional, tetrachlorophthalato-bridged samarium complex [Sm(tcph)2(H2O)6]Hpip·5H2O (1) (tcph = tetrachlorophthalate dianion, pip = piperidine) has been synthesized and characterized by an X-ray structure determination. The title complex contains an unusual dimer formed by very short hydrogen bonds and gives a three-dimensional network by means of extensive hydrogen bonds. The fluorescence spectrum of 1 was measured.

Heterobinuclear copper(II)–manganese(II) complexes behaving as three-dimensional supramolecular networks via both macrocyclic oxamido-bridges and hydrogen bonds

Two novel oxamido-bridged heterobinuclear copper(II)–manganese(II) complexes derived from macrocylic oxamido compounds incorporating different blocking ligands were synthesized and characterized by IR and electronic spectroscopy. They are of formula [Cu(L)Mn(phen)2](ClO4)2·1.5H2O (1) and [Cu(L)Mn(ntb)](ClO4)2·H2O (2), where L = 1,4,8,11-tetraazacyclotetradecane-2,3-dione, phen = 1,10-phenanthroline and ntb = tris(2-benzimidazolylmethyl)amine. The crystal structures of the two complexes have been determined and they consist of binuclear units in which the copper(II) ion is in a square-planar environment and linked to the manganese(II) ion via the exo–cis oxygen atoms of the oxamido macrocyclic ligand, with Cu⋯Mn separations of 5.421 (1) and 5.486 A (2), respectively. The packing of the molecules along the a orientation in 2 results in open channels, which were extended into a three-dimensional hydrogen-bonded supramolecular network. The temperature dependence of the magnetic susceptibility for 1 and 2 were analyzed by means of the Hamiltonian, Ĥ = −2JŜMnŜCu, leading to J = −14.2 and −14.7 cm−1 for 1 and 2, respectively.