Jiangfeng Xiang

Supramolecular hydrogen bond framework constructed by 1-aminoethylidenediphosphonic acid and monovalent ions: Li + , Na + , and

Four new monovalent 1-aminoethylidenediphosphonates, [Li(AEDPH3)(H2O)]6 (1), Na2(AEDPH3)2(H2O)8 (2), (NH4)(AEDPH3) (3) and ((CH3)2NH2)(AEDPH3)(H2O) (4) have been synthesized and characterized by elemental analysis, IR, TG together with X-ray single crystal diffraction analysis. Compound 1 is a 24-metallacrown-6 lithium structure, compound 2 is binuclear Na+ bridged by water molecules, and compounds 3 and 4 are proton-transfer salts. All four compounds are further extended to form three-dimensional (3D) supramolecular structures with the aid of water molecules (excluding 3) via various predictable hydrogen bonds.

Self-assembly of organic acid–base compounds from 2-D layered network to 3-D supramolecular framework: synthesis, structure and photoluminescence

The reactions of organophosphonic acids [1-aminoethylidenediphosphonic acid (AEDPH4), 1-aminopropane-1,1,3-triphosphonic acid (APTPH6)] and 2,2′-bipyridyl-like ligands [2,2′-bipyridyl (bipy), 1,10-phenanthroline (phen)] under low temperature hydrothermal conditions yielded four acid–base compounds, namely, (AEDPH3)·(H2bipy)1/2·2H2O (1), (AEDPH3)·(Hphen)·2H2O (2), (APTPH5)·(Hbipy)·2H2O (3) and (APTPH4)·(Hphen)·(H3O)·3H2O (4). These four compounds were characterized by a single crystal X-ray diffraction method, elemental analysis (EA), infrared spectrometry (IR) and thermogravimetric analysis (TGA). They all crystallize in a triclinic system, with a P space group. In particular, the supramolecular structures of organophosphonic acids in these four compounds are different. In compounds 1 and 2, the dimer or dimer chains are formed by hydrogen bonds between adjacent phosphonate groups, while in compounds 3 and 4 two-dimensional (2-D) layered networks are constructed by the hydrogen bonds between the phosphonate groups. The diversity of supramolecular structures is due to the difference of AEDPH4 and APTPH6 ligands. Additionally, their luminescence in the solid state has also been studied at room temperature.

Rheological phase synthesis, characterization and magnetic property of a cobalt(II)diphosphonate

A new Co(II) diphosphonate compound, [Co(HEDPH2)2] (4,4′-bipyH2) · H2O (1) has been successfully obtained by a rheological phase reaction at 80°C. Single-crystal diffraction analysis shows a 1-D chain structure and the 1-D chains are assembled via hydrogen bonds into a 3-D supramolecular structure with channels. The protonated 4,4′-bipy molecules are encapsulated in the channels. Magnetic study shows 1 to exhibit antiferromagnetic interaction in the 1D Co--O--P--O--Co chain. Crystal data for 1: monoclinic, space group Cc, a = 15.754(6) Å, b = 14.457(5) Å, c = 10.020(4) Å, β = 92.024(6)°, V = 2280.7(14) Å3, Z = 4.

Hydrothermal synthesis, structures and characterization of two new copper(II) triphosphonate compounds

Two copper(II) triphosphonate compounds, Cu[(APTPH4)(phen)(H2O)] · 2.16H2O (1) and [Cu(APTPH4)(2,2′-bipy)(H2O)] · 2.63H2O (2), have been prepared by a low temperature hydrothermal reaction from 1-aminopropane-1,1,3-triphosphonic acid (APTPH6), CuO and a second ligand, phen = 1,10-phenanthroline, or 2,2′-bipy = 2,2′-bipyridyl. These two compounds were characterized by single crystal X-ray diffraction, elemental analysis, IR and TG. Crystal data for 1: Monoclinic, space group P21 /c, a = 14.4830(7) Å, b = 9.1721(5) Å, c = 16.7403(8) Å, β = 90.101(2)°. For compound 2: Triclinic, space group P 1, a = 7.1215(7) Å, b = 10.460(2) Å, c = 14.671(2) Å, α = 82.983(2)°, β = 83.882(2)°, γ = 80.617(2)°. In both compounds, each Cu2+ ion is five-coordinate with two oxygen atoms from the triphosphonate, two nitrogen atoms from the second ligand and one water molecule, to form a distorted square-pyramidal geometry. Both complexes have 3D supramolecular structures constructed by hydrogen bonds and π–π stacking interactions.