Tian-Wei Wang
Nanjing University
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Featured researches published by Tian-Wei Wang.
Inorganic Chemistry | 2010
Ying Wang; Xi-Li Li; Tian-Wei Wang; You Song; Xiao-Zeng You
A series of one-dimensional complexes [Ln(L(1))(3)(HOCH(2)CH(2)OH)](n) (L(1) = 2-furoate anion; Ln = Nd (1), Sm (2), Gd (3), Tb (4), Dy (5), Er (6)) have been synthesized. The complexes were crystallized in the monoclinic space group P2(1)/c and show a chain-like structure determined by single-crystal X-ray diffraction. Magnetic properties indicate that carboxyl group of 2-furoate mediates different magnetic couplings in light and heavy rare earth complexes, namely, antiferromagnetic interaction between light rare earth ions and ferromagnetic interaction between heavy ones. Noticeably, complex 5 displays a strong frequency dependence of alternating current (AC) magnetic properties. Further magnetic studies show a distribution of a single relaxation process in 5. While 1,10-phenanthroline and phthalate anion (L(2)) were employed, [Dy(2)(L(2))(6)(H(2)O)](n) (7) was isolated by hydrothermal reactions and characterized magnetically. Research results also show the frequency dependence of AC magnetic susceptibilities, although the phthalate anions mediate antiferromagnetic coupling between Dy(III) ions. Further magnetic investigation of a neutral mononuclear complex with the formula [Dy(TTA)(3)(L(3))] (8) (TTA = 2-thenoyltrifluoroacetonate; L(3) = 4,5-pinene bipyridine) suggests that the single-ion magnetic behavior originates the slow relaxation of Dy(III)-containing complexes.
Chemical Communications | 2011
Dong-Ping Li; Xiao-Peng Zhang; Tian-Wei Wang; Bin-Bin Ma; Cheng-Hui Li; Yi-Zhi Li; Xiao-Zeng You
Two polymorphs of the same Dy(III) complex show distinct slow magnetic relaxation behaviors due to the different local environments of Dy(III) in the crystal. This work represents the first example where the magnetic dynamic property of neutral rare earth complexes could be tuned by growing polymorphic crystals without changing the ligand.
Inorganic Chemistry | 2012
Jian Liu; Xiao-Peng Zhang; Tao Wu; Bin-Bin Ma; Tian-Wei Wang; Cheng-Hui Li; Yi-Zhi Li; Xiao-Zeng You
Two new enantiomeric ionic chiral dysprosium(III) compounds were designed and synthesized. These compounds show simultaneously the optical activity, ferroelectric effects, nonlinear-optical effects, and slow magnetic relaxation behavior. More interestingly, these compounds exhibit reversible single-crystal-to-single-crystal transformations associated with the release or absorption of solvent molecules. The structure transformations are accompanied by distinct changes in the physical properties.
Inorganic Chemistry | 2010
Tian-Wei Wang; Jun Wang; Shin-ichi Ohkoshi; You Song; Xiao-Zeng You
A series of three-dimensional (3D) octacyanometallate-based bimetallic magnets, {[Mn(H(2)O)][Mn(0.75)(HCOO)(0.5)(H(2)O)(0.5)][W(CN)(8)] x H(2)O}(4n) (1), {[Mn(2)(HCOO)(HCOOH)][M(CN)(8)] x H(2)O}(n) (M = W (2) and Mo (3)), and {[Mn(2)(HCOO)(HCOOH)][W(CN)(8)] x CH(3)OH}(n) (M = W (4) and Mo (5)), were synthesized by the reaction of octacyanometallates A(3)[M(CN)(8)] x nH(2)O (A = Na, Cs, and (C(4)H(9))(3)NH; M = W and Mo; and n = 2 or 4) with manganese salt (Mn(CH(3)COO)(2) x 4 H(2)O, Mn(ClO(4))(2) x 6 H(2)O, and MnCl(2) x 4 H(2)O) in aqueous or methanolic solution containing formic acid. All complexes crystallize in the tetragonal or orthorhombic system. Complex 1 shows an unexpected 3D network structure by connections of manganese ions and octacyanotangstate-manganese double layers via cyanide bridges, while other complexes have typical structure constructions similar to the reported complexes {[MnL](m)[M(CN)(8)]}(n) (L = CH(3)COO(-), Cl(-), and H(2)O), which the CN group of [W(V)(CN)(8)] coordinates to eight Mn(II) ions forming a -[W(CN)(8)]-Mn(4)-[W(CN)(8)]-Mn(4)- columnar chain, and then all chains share Mn(II) ions as the nodes interlocking with each other to form the 3D networks. Magnetic studies indicate that the cyanide group mediates the antiferromagnetic coupling between octacyanometallates and manganese ions in all complexes, and the ferrimagnetic phase transition temperatures are 53, 52, 42, 49, and 41 K for 1-5, respectively.
Chemistry: A European Journal | 2009
Ying Wang; Tian-Wei Wang; Hong-Ping Xiao; Yi-Zhi Li; You Song; Xiao-Zeng You
By using cyclohexane-1,2-diamine (chxn), Ni(ClO(4))(2) x 6 H(2)O and Na(3)[Mo(CN)(8)] x 4 H(2)O, a 3D diamond-like polymer {[Ni(II)(chxn)(2)](2)[Mo(IV)(CN)(8)] x 8 H(2)O}(n) (1) was synthesised, whereas the reaction of chxn and Cu(ClO(4))(2) x 6 H(2)O with Na(3)[M(V)(CN)(8)] x 4 H(2)O (M = Mo, W) afforded two isomorphous graphite-like complexes {[Cu(II)(chxn)(2)](3)[Mo(V)(CN)(8)](2) x 2 H(2)O}(n) (2) and {[Cu(II)(chxn)(2)](3)[W(V)(CN)(8)](2) x 2 H(2)O}(n) (3). When the same synthetic procedure was employed, but replacing Na(3)[Mo(CN)(8)] x 4 H(2)O by (Bu(3)NH)(3)[Mo(CN)(8)] x 4 H(2)O (Bu(3)N = tributylamine), {[Cu(II)(chxn)(2)Mo(IV)(CN)(8)][Cu(II)(chxn)(2)] x 2 H(2)O}(n) (4) was obtained. Single-crystal X-ray diffraction analyses showed that the framework of 4 is similar to 2 and 3, except that a discrete [Cu(chxn)(2)](2+) moiety in 4 possesses large channels of parallel adjacent layers. The experimental results showed that in this system, the diamond- or graphite-like framework was strongly influenced by the inducement of metal ions. The magnetic properties illustrate that the diamagnetic [Mo(IV)(CN)(8)] bridges mediate very weak antiferromagnetic coupling between the Ni(II) ions in 1, but lead to the paramagnetic behaviour in 4 because [Mo(IV)(CN)(8)] weakly coordinates to the Cu(II) ions. The magnetic investigations of 2 and 3 indicate the presence of ferromagnetic coupling between the Cu(II) and W(V)/Mo(V) ions, and the more diffuse 5d orbitals lead to a stronger magnetic coupling interaction between the W(V) and Cu(II) ions than between the Mo(V) and Cu(II) ions.
CrystEngComm | 2010
Jing Li; Chang-Chun Ji; Zhenzhong Lu; Tian-Wei Wang; You Song; Yi-Zhi Li; He-Gen Zheng; Zijian Guo; Stuart R. Batten
Five new complexes, [Ln(OABDC)(H2O)5]n·2nH2O [Ln = Sm (1), Eu (2), Dy (3)], [Ni4(OABDC)2(OH)2(H2O)4]n·4nH2O (4), [Cu2(OABDC)(4,4′-bipy)0.5(OH)]n (5) have been synthesized by the hydrothermal reaction of a unique scorpion-shaped carboxylate ligand (5-oxyacetate isophthalic acid = H3OABDC) with different lanthanide or transition metals in the presence or absence of auxiliary 4,4′-bipyridine ligand. Their structures have been determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra, and thermogravimetric analysis. Compounds 1–3 are isostructural: the metal ions are bridged through carboxylate oxygen atoms to form 1D zigzag chains, and adjacent chains are further extended to a 3D supramolecular structure via hydrogen bonds. Compound 4 has a two-dimensional (2D) metal–organic framework based on [Ni4(μ3-OH)2]6+ clusters, which are further connected by intermolecular hydrogen bonds to form a 3D network. In compound 5, multicarboxylate ligands link Cu centers to generate a 2D sheet structure which is further connected by auxiliary 4,4′-bipyridine ligand to form a 3D structure. Free H3OABDC ligand and complexes 1, 2 exhibit strong fluorescent emissions in the visible region. Magnetic susceptibility measurements indicate that 4 exhibits weak ferromagnetic coupling between adjacent Ni(II) ions, whereas 5 shows antiferromagnetic coupling between Cu(II) ions.
Chemistry Letters | 2003
Yun-Qi Tian; Chen-Xin Cai; Xue-Jun Yuan; Yi-Zhi Li; Tian-Wei Wang; Xiao-Zeng You
Molecular spontaneous assembly of In(III) and bidentate ditopic ligand (pzdc) gives a novel compound with four-connected 3D framework which demonstrates a NbO-like net.
Chemical Communications | 2010
Dong-Ping Li; Tian-Wei Wang; Cheng-Hui Li; Dong-Sheng Liu; Yi-Zhi Li; Xiao-Zeng You
Inorganic Chemistry | 2008
Zhaorui Pan; He-Gen Zheng; Tian-Wei Wang; You Song; Yi-Zhi Li; Zijian Guo; Stuart R. Batten
Angewandte Chemie | 2007
Xi-Li Li; Kai Chen; Yu Liu; Zhao-Xi Wang; Tian-Wei Wang; Jing-Lin Zuo; Yi-Zhi Li; Yue Wang; Jin Song Zhu; Jun‐Min Liu; You Song; Xiao-Zeng You