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Liu C.-M.,CAS Beijing National Laboratory for Molecular | Song Y.,Coordination Chemistry Institute | Zhang D.-Q.,CAS Beijing National Laboratory for Molecular
Inorganic Chemistry Communications | Year: 2010

The new azido-bridged cobalt cluster complex, [Co2 II Co2 III μ1, 1 - N3)4 (N3)2 (HDMSP)2 (MeOH)2] · 2 H2 O (H3DMSP = 1,3-dihydroxy-2-methyl-2-(salicylideneamino)propane), is the first azido-bridged mixed-valent cobalt complex showing a defective double cubane structure. Magnetic study indicated that there is an antiferromagnetic interaction between two Co2+ ions. © 2009 Elsevier B.V. All rights reserved. Source

Huang Y.-Q.,Shandong University of Science and Technology | Wan Y.,Shandong University of Science and Technology | Cheng H.-D.,Shandong University of Science and Technology | Zhao Y.,Coordination Chemistry Institute
Jiegou Huaxue | Year: 2014

Two new Ag(I) complexes {Ag2(L)(NO3)(H 2O)}n (1) and {Ag(L)}n·nH2O (2) have been synthesized via the reaction of silver nitrate and betaine derivative 1-carboxyme-thylpyridinium-3-carboxylate (L) by only changing the metal-to-ligand ratio. The results of X-ray crystallographic analysis indicate that complexes 1 and 2 both crystallize in the monoclinic space group P2 1/c with a = 5.0809(14), b = 17.390(5), c = 13.399(4) Å, β = 91.677(5)°, V = 1183.4(6) Å3, Z = 4, Mr = 475.90, Dc = 2.671 g/cm3, F(000) = 912, μ = 3.352 mm-1, S = 1.259, the final R = 0.0320 and wR = 0.0831 for 2036 observed reflections with I > 2σ(I) for 1 and a = 12.180(2), b = 5.0283(10), c = 14.396(3) Å, β = 94.87(3)°, V = 878.5(3) Å3, Z = 4, Mr = 306.02, Dc = 2.314 g/cm3, F(000) = 600, μ = 2.294 mm-1, S = 1.053, the final R = 0.0283 and wR = 0.0684 for 2011 observed reflections with I > 2σ(I) for 2. Complexes 1 and 2 both feature a unique 2D structure. For 1, the 2D undulated network consists of 1D infinite helical chains running parallel to the b axis, while for 2, the 2D network is made up of 1D tubes along the b axis. Moreover, the Ag···Ag interactions in complexes 1 and 2 are also discussed. Source

Duan H.-B.,Nanjing University of Technology | Ren X.-M.,Nanjing University of Technology | Ren X.-M.,Coordination Chemistry Institute | Meng Q.-J.,Coordination Chemistry Institute
Coordination Chemistry Reviews | Year: 2010

1D spin-Peierls-like complexes assembled from [Ni(mnt)2]- with Λ-shaped 1-(4′-R-benzyl)pyridinium derivatives (R represents a substituent) are reviewed, with data on their crystal structures, magnetic properties under ambient conditions as well as under pressure, and the nature of the paramagnetic-to-nonmagnetic transition. In this series of 1D spin systems, the correlation between the magnetic exchange and the anion stacking pattern is addressed by application of density functional theory (DFT) combined with a broken-symmetry approach. The qualitative relationship between the transition enthalpy change and the variation of the magnetic susceptibility in the low-temperature phase is determined. The influence of nonmagnetic doping on the structural and magnetic properties and the magnetic transitions are reported. Furthermore, the effect of the substituent group in the phenyl ring of the cation on the transition temperature and the origin of the transition are discussed. © 2009 Elsevier B.V. All rights reserved. Source

Lin J.-G.,Coordination Chemistry Institute | Lin J.-G.,Jiangsu Institute of Nuclear Medicine | Qiu L.,Jiangsu Institute of Nuclear Medicine | Wang F.-M.,Coordination Chemistry Institute | And 3 more authors.
Inorganic Chemistry Communications | Year: 2010

Employing the tetrapodal compound 1,2,3,4-tetra(4-pyridyl)thiophene (TPT) as a bridging ligand, a new metal-organic framework was obtained and characterized by single crystal X-ray diffraction, [Cd(TPT)(N3)2·(H2O)] (1). This polymer exhibits a 2D layer network and an unprecedented 3,4-connected topology, which is constructed from the three-connector TPT and EE azido bridges. It also displays good thermal stability and strong photoluminescence in the blue regionband thus may serve as a candidate of thermally stable blue-light-emitting electroluminescence material. The nature of electronic transitions in the photoluminescent process has also been investigated by means of time-dependent density functional theory (TDDFT) calculations and molecular orbital analyses, which shows that the luminescent property is ligand-based. © 2009 Elsevier B.V. All rights reserved. Source

Hong J.,Coordination Chemistry Institute | Hong J.,China Pharmaceutical University | Jiao Y.,Coordination Chemistry Institute | Yan J.,Nanjing University | And 4 more authors.
Inorganica Chimica Acta | Year: 2010

Asymmetric trigonal-bipyramidal Zn(II) complex 1 formed by 2-[bis(2-aminoethyl)amino]ethanol (L) was found to be able to promote the cleavage of supercoiled plasmid DNA pBR322 to the nicked and linear DNA via a hydrolytic manner but only in neutral Tris-HCl buffer, no cleavage was observed in HEPES or NaH 2PO 4/Na 2HPO 4 buffer. However, the copper complex 2 of L, possessing the similar coordination geometry, can only promote DNA cleavage via an oxidative mechanism in the presence of ascorbic acid. ESI-MS study implies that complex 1 exist mainly as [Zn(L)] 2+/[Zn(L-H)] + in neutral Tris-HCl buffer. Moreover, there is no discriminable species for complex 1 in HEPES or NaH 2PO 4/Na 2HPO 4 buffer. A phosphate activation mechanism via phosphate coordinating to Zn(II) center of [Zn(L)] 2+/[Zn(L-H)] + to form the stable trigonal-bipyramidal structure is proposed for the hydrolytic cleavage promote by complex 1. For complex 2, the abundance of [Cu(L)Cl] + is higher than that of [Cu(L)] 2+/[Cu(L-H)] + in Tris-HCl buffer. The lower phosphate binding/activating ability of Cu(II) in complex 2 may be the origin for its incapability to promote the hydrolytic DNA cleavage. However, the readily accessible redox potential of Cu(II) makes complex 2 promote the oxidative DNA cleavage. Although the DNA cleavage promoted by complex 1 has no specificity, trigonal-bipyramidal Zn(II) complexes formed by asymmetric tripodal polyamine with ethoxyl pendent should be a novel potential model for practical artificial nuclease. © 2009 Elsevier B.V. All rights reserved. Source

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