A new coordination polymer of Cd(Ⅱ) was prepared by the reaction of Cd(ClO4)2·6H2O with mixed ligands, namely, neutral double betaine derivative 1,3-bis(pyridinio-4-carboxylato)propane and SCN- anion in aqueous ...A new coordination polymer of Cd(Ⅱ) was prepared by the reaction of Cd(ClO4)2·6H2O with mixed ligands, namely, neutral double betaine derivative 1,3-bis(pyridinio-4-carboxylato)propane and SCN- anion in aqueous solution. The crystal structure of 1 has been determined by single-crystal X-ray diffraction methods. Crystal data for 1: orthorhombic, space group P212121, a=1.050 9(2), b=1.162 8(2), c=1.649 5(3) nm, V=2.015 7(7) nm3, Z=4, F(000)=1 064, Dc=1.756 g·cm-3, the final R=0.050 8 and wR=0.130 1 for 3 530 observed reflections [I>2σ(I)]. Crystal structure of 1 indicates that the ( μ-1,3-NCS) bridging NCS- ligand connects neighboring cadmium atoms, leading to a single strand helical chain which propagates along crystallographic a axis. The metallic nodes of adjacent helical chains are linked by monodentate-monodentate coordination mode of both carboxylate groups in L molecules to generate 2D coordination sheet which parallels to the (001) plane. Adjacent layers are further joined by C-H…O hydrogen bonds; the structure thus expanded into a three-dimensional network. CCDC: 612657.展开更多
Two new polymeric erbium(Ⅲ) complexes of two flexible double betaine ligands have been synthesized and characterized by X-ray analysis. In {[Er(L1)(H2O)4)Cl3 H2O}n (1) (L1 = 4, 4’ -trimethylenedipyridinio-N, N’-dia...Two new polymeric erbium(Ⅲ) complexes of two flexible double betaine ligands have been synthesized and characterized by X-ray analysis. In {[Er(L1)(H2O)4)Cl3 H2O}n (1) (L1 = 4, 4’ -trimethylenedipyridinio-N, N’-diacetate ), the erbium(Ⅲ) ions form a two-dimensional metal carboxylate layer in which each pair of Er(Ⅲ) atoms is bridged by two syn-anti μ-carboxylato-o,o’ groups, Adjacent layers arecross-linked through hydrogen bonds among aqua ligands, lattice water molecules andchloride ions to form a three-dimensional network. Complex l, C17 H28 N2 O9 ErC13 (Mr =676.0) is monoclinic, space group C2, with a= 27. 408(4), b= 9. 645 (3), c= 9. 423(2) A, p=1loo. 85(1)’, V=2446. 2(9) A’, Z=4, D=l. 836 g/cm’, F(OOO) =1332, μ(MoKa) = 38.06 cm-1, R=0. 048 for 2451 reflections with I>2σ(I). { [Er(L2 ) (H2O)4]Cl3. 5H2O}. (2) (L2=1, 3-bis (pyridinio-4-carboxylato) propane) comprises lanthanide carboxylate chains built from centrosymmetric dimeric units crosslinked by a pair of L2 ligands, discrete anions and lattice water molecules. In the dimeric unit of complex 2, each pair of metal ions is bridged by four syn-syn μ-carboxylatoO, O’ groups that are oriented nearly perpendicular to each other about the metal-metalaxis. The metal carboxylate chains of complex 2 are further cross-linked by hydrogenbonds to form a three-dimensional network. Complex 2, C15 H32 N2O13 ErCl3 (Mr=722.0) belongs to the monoclinic space group C2/m with a=16. 564 (3), b=15. 839(3), c=11. 792(4) , β=122. 27(1)°, V=2616(1), Z=4, Dc=1.833 g/cm3,F(000) =1436, μ (MoKa) = 35. 75 cm-1, R =0.043 for 2436 observed reflectionswithI>2σ(I).展开更多
Phase separation behavior of cocamidopropyl betaine/water/polyethylene glycol （PEG） system was studied. The effects of concentration and molecular weight of PEG on the phase separation behavior were investigated. Cl...Phase separation behavior of cocamidopropyl betaine/water/polyethylene glycol （PEG） system was studied. The effects of concentration and molecular weight of PEG on the phase separation behavior were investigated. Clouding occurred when the concentration of PEG was large enough in the betaine aqueous solution, and the concentration of PEG at cloud point decreased with the increase of PEG molecular weight for a constant betaine concentration. The bottom phase was the PEG-rich phase, and the upper phase was the betaine-rich phase. The volumetric ratio of PEG-rich phase to betaine-rich phase, at the same difference between the PEG concentration and the one at the cloud poim, △Ccp （0.1 g.ml^-1）, decreased as the PEG molecular weight increased and approached 1 for higher PEG molecular Weiglai （about 20000）, which was similar to the typicai-aqueous two-phase system. This volumetric ratio depended on the initial PEG concentration, but independent of PEG molecular weight. The concentration ratio of betaine to PEG in both phases depended on the △Ccp independent of PEG molecular weight.展开更多
A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The si...A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The single crystal X ray structural analysis of 1 indicates that the compound crystallizes in space group P1(No.2) with a=12.652(3),b=18.983(4),c=9.102(3),α=97.26(2)°,β=107.38(2)°,γ=102.22(2)° and Z=1.In complex 1,a pair of Cu(Ⅱ) atoms are bridged by carboxylate groups of four ligand molecules with a Cu…Cu distance of 2.738 to form a tetrakis (carboxylato O,O) bridge dimetal core,and the apical coordination positions are occupied by monodentate nitrato anions,which is rare in the structures of similar Cu(Ⅱ) complexes in which the apical ligands are usually neutral molecules.The result shows that introducing the anionic ligands into the coordination sphere of the Cu(Ⅱ) atom significantly increases the Cu…Cu distance.展开更多
文摘A new coordination polymer of Cd(Ⅱ) was prepared by the reaction of Cd(ClO4)2·6H2O with mixed ligands, namely, neutral double betaine derivative 1,3-bis(pyridinio-4-carboxylato)propane and SCN- anion in aqueous solution. The crystal structure of 1 has been determined by single-crystal X-ray diffraction methods. Crystal data for 1: orthorhombic, space group P212121, a=1.050 9(2), b=1.162 8(2), c=1.649 5(3) nm, V=2.015 7(7) nm3, Z=4, F(000)=1 064, Dc=1.756 g·cm-3, the final R=0.050 8 and wR=0.130 1 for 3 530 observed reflections [I>2σ(I)]. Crystal structure of 1 indicates that the ( μ-1,3-NCS) bridging NCS- ligand connects neighboring cadmium atoms, leading to a single strand helical chain which propagates along crystallographic a axis. The metallic nodes of adjacent helical chains are linked by monodentate-monodentate coordination mode of both carboxylate groups in L molecules to generate 2D coordination sheet which parallels to the (001) plane. Adjacent layers are further joined by C-H…O hydrogen bonds; the structure thus expanded into a three-dimensional network. CCDC: 612657.
文摘Two new polymeric erbium(Ⅲ) complexes of two flexible double betaine ligands have been synthesized and characterized by X-ray analysis. In {[Er(L1)(H2O)4)Cl3 H2O}n (1) (L1 = 4, 4’ -trimethylenedipyridinio-N, N’-diacetate ), the erbium(Ⅲ) ions form a two-dimensional metal carboxylate layer in which each pair of Er(Ⅲ) atoms is bridged by two syn-anti μ-carboxylato-o,o’ groups, Adjacent layers arecross-linked through hydrogen bonds among aqua ligands, lattice water molecules andchloride ions to form a three-dimensional network. Complex l, C17 H28 N2 O9 ErC13 (Mr =676.0) is monoclinic, space group C2, with a= 27. 408(4), b= 9. 645 (3), c= 9. 423(2) A, p=1loo. 85(1)’, V=2446. 2(9) A’, Z=4, D=l. 836 g/cm’, F(OOO) =1332, μ(MoKa) = 38.06 cm-1, R=0. 048 for 2451 reflections with I>2σ(I). { [Er(L2 ) (H2O)4]Cl3. 5H2O}. (2) (L2=1, 3-bis (pyridinio-4-carboxylato) propane) comprises lanthanide carboxylate chains built from centrosymmetric dimeric units crosslinked by a pair of L2 ligands, discrete anions and lattice water molecules. In the dimeric unit of complex 2, each pair of metal ions is bridged by four syn-syn μ-carboxylatoO, O’ groups that are oriented nearly perpendicular to each other about the metal-metalaxis. The metal carboxylate chains of complex 2 are further cross-linked by hydrogenbonds to form a three-dimensional network. Complex 2, C15 H32 N2O13 ErCl3 (Mr=722.0) belongs to the monoclinic space group C2/m with a=16. 564 (3), b=15. 839(3), c=11. 792(4) , β=122. 27(1)°, V=2616(1), Z=4, Dc=1.833 g/cm3,F(000) =1436, μ (MoKa) = 35. 75 cm-1, R =0.043 for 2436 observed reflectionswithI>2σ(I).
基金Supported by the National Natural Science Foundation of China （20676069）.
文摘Phase separation behavior of cocamidopropyl betaine/water/polyethylene glycol （PEG） system was studied. The effects of concentration and molecular weight of PEG on the phase separation behavior were investigated. Clouding occurred when the concentration of PEG was large enough in the betaine aqueous solution, and the concentration of PEG at cloud point decreased with the increase of PEG molecular weight for a constant betaine concentration. The bottom phase was the PEG-rich phase, and the upper phase was the betaine-rich phase. The volumetric ratio of PEG-rich phase to betaine-rich phase, at the same difference between the PEG concentration and the one at the cloud poim, △Ccp （0.1 g.ml^-1）, decreased as the PEG molecular weight increased and approached 1 for higher PEG molecular Weiglai （about 20000）, which was similar to the typicai-aqueous two-phase system. This volumetric ratio depended on the initial PEG concentration, but independent of PEG molecular weight. The concentration ratio of betaine to PEG in both phases depended on the △Ccp independent of PEG molecular weight.
文摘A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The single crystal X ray structural analysis of 1 indicates that the compound crystallizes in space group P1(No.2) with a=12.652(3),b=18.983(4),c=9.102(3),α=97.26(2)°,β=107.38(2)°,γ=102.22(2)° and Z=1.In complex 1,a pair of Cu(Ⅱ) atoms are bridged by carboxylate groups of four ligand molecules with a Cu…Cu distance of 2.738 to form a tetrakis (carboxylato O,O) bridge dimetal core,and the apical coordination positions are occupied by monodentate nitrato anions,which is rare in the structures of similar Cu(Ⅱ) complexes in which the apical ligands are usually neutral molecules.The result shows that introducing the anionic ligands into the coordination sphere of the Cu(Ⅱ) atom significantly increases the Cu…Cu distance.
