Da-Peng Dong

Synthesis, structure, surface photovoltage and magnetic properties of a novel 3D homochiral manganese phosphonate with right-handed helical chains

A novel 3D homochiral manganese phosphonate with right-handed helical chains, [enH2]0.5Mn2[(HL)(L)] (1) (H3L = 2-hydroxyphosphonoacetic acid; en = ethylenediamine) has been synthesized by hydrothermal techniques. X-Ray diffraction analysis indicates that compound 1 consists of A channels with right-handed single helical chains, B channels with right-handed double helical chains and C channels with achiral channels that are connected through manganese centers and L3− ligands to form a homochiral coordination polymer. Surface photovoltage spectroscopy (SPS) of compound 1 indicates that it possesses positive SPV response in the range of 300–600 nm and shows p-type semiconductor characteristic. Magnetic susceptibility studies of compounds 1 reveal that there exist weak antiferromagnetic interactions between the manganese centers.

Hydrothermal syntheses, crystal structures and thermal stability of two divalent metal phosphonates with a layered and a 3D structure

Two new divalent metal phosphonates, [Cu2{CH3C(OH)(PO3)2}(H2O)2] · 0.5H2O (1) and [NH3CH2CH2NH3][Zn3{CH3C(OH)(PO3)2}2(H2O)] · H2O (2), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction as well as with infrared spectroscopy, elemental analysis and thermogravimetric analysis. The structure of 1 comprises [Cu3(hedp)2]2− layers connected by [CuO4] units to form a 3D open-framework structure with a one-dimensional channel system along the b axis. In 2, the connections of alternately arranged [ZnO4] tetrahedra, [ZnO6] octahedra and [CPO3] tetrahedra via vertex-sharing result in a 2D layered structure. The protonated ethylenediamine cations and water molecules are located between adjacent layers.

Hydrothermal synthesis and crystal structures of two new divalent metal phosphonates with layered structure

Two divalent metal phosphonates with a layered structure, Zn(H2L) (1) and Cd2L (2) (H4L = CH3CH2CH2N(CH2PO3H2)2), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction as well as with infrared spectroscopy, elemental analysis and thermogravimetric analysis. The structure of 1 shows a layered structure in which the 1D zinc(II) phosphonate chains are interconnected by bridging organic groups to form 2D layers. In 2, the interconnection of [CdO5N] and [CdO5] polyhedra via edge-sharing forms a dimer. The dimers are interconected by [CPO3] tetrahedra via corner-sharing to form 2D double layers in the bc-plane.

Hydrothermal syntheses, crystal structures, and thermal stability of two new 3D open-framework metal(II) phosphonates

This article reports the hydrothermal synthesis and characterization of two new phosphonate compounds NaCo[O3PCH(OH)CO2] (1) and NaMn[O3PCH(OH)CO2] (2) based on 2-hydroxyphosphonoacetic acid (H3L). Their structures have been characterized by single-crystal X-ray diffraction as well as with elemental analysis, infrared spectroscopy and thermogravimetric analysis. The two isomorphous compounds crystalline in the orthorhombic, space group Pbca: Crystal data for 1: a = 10.1827(8) Å, b = 9.6673(8) Å, c = 10.7853(9) Å, V = 1061.70(15) Å3, Z = 8, R 1 = 0.0252, wR 2 = 0.0577; Crystal data for 2: a = 10.4309(18) Å, b = 9.7913(17) Å, c = 10.9012(19) Å, V = 1113.4(3) Å3, Z = 8, R 1 = 0.0194, wR 2 = 0.0536. In the two compounds, the metal atoms are octahedrally coordinated; all oxygen atoms from the H3L ligand are involved in coordination. The overall structures can be described as a 3D open framework with channels running along the a axis and the charge-compensating Na+ cations being located at the intersections of these channels.

Hydrothermal synthesis and crystal structures of Mn(II) and Cd(II) aminophosphonates with a layered structure

Two new divalent metal aminodiphosphonates with a layered structure, Mn2[(HL)(H2O)F]·H2O (1) and Cd3.5[(HL)L] (2) (H4L  = CH3CH2CH2N(CH2PO3H2)2), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction as well as with infrared spectroscopy, elemental analysis and thermogravimetric analysis. In 1, two MnO4F2 and two MnO5F polyhedra are interconnected via edge-sharing into a tetramer, and such tetramers are bridged by the diphosphonate ligands into a Mn(II) phosphonate layer in the ab-plane. The structure of 2 also features a 2D layered structure, in which the CdO5N and CdO6 polyhedra are interconnected into a 1D chain. The chains are then cross-linked via phosphonate oxygen atoms to form Cd(II) phosphonate layers in the ab-plane.

Hydrothermal synthesis, crystal structure and thermal stability of a new 2D layered metal(II) phosphonate: [NH3CH2CH2NH3][Fe2(O3PCH(OH)CO2)2(H2O)2]·2H2O

In the presence of ethylenediamine template agents, a metal(II) phosphonate, [NH3CH2CH2NH3][Fe2(O3PCH(OH)CO2)2(H2O)2] · 2H2O (1) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction as well as infrared spectroscopy, elemental analysis and thermogravimetric analysis. The compound crystallines in the monoclinic space group P21/n: Crystal data for 1: a = 8.4523(8) Å, b = 9.8196(9) Å, c = 10.9217(10) Å, β = 105.9500(10)°, V = 871.58(14) Å, Z = 2, D c = 2.103 g cm−3, R 1 = 0.0290, wR 2 = 0.0811. The Fe (II) cation is octahedrally coordinated by six oxygen atoms from the three ligands and one coordinated water molecule to form a 2D layered structure with a one-dimensional channel system in the a-axis direction.

CCDC 760618: Experimental Crystal Structure Determination

Related Article: Da-Peng Dong, Lei Liu, Zhen-Gang Sun, Cheng-Qi Jiao, Zhong-Min Liu, Chao Li, Yan-Yu Zhu, Kai Chen, Cheng-Lin Wang|2011|Cryst.Growth Des.|11|5346|doi:10.1021/cg2009368

CCDC 784630: Experimental Crystal Structure Determination

Related Article: Wei-Nan Wang, Zhen-Gang Sun, Yan-Yu Zhu, Da-Peng Dong, Jing Li, Fei Tong, Cui-Ying Huang, Kai Chen, Chao Li, Cheng-Qi Jiao, Cheng-Lin Wan|2011|CrystEngComm|13|6099|doi:10.1039/c1ce05291h