NH_4)_(12)(V_(10)O_(28))_2·(H_2O)_(12)M_r=2347. 44 , triclinic, P1, a=10. 155 (1), b=10. 286(3) , c=16. 732(9) A, a=96. 50(4), β=87.18(4),γ=108. 99 (1)°, V=1642(4) A ￣3, Z=1, D_c=2. 37 g/cm￣3, F(000)=11...NH_4)_(12)(V_(10)O_(28))_2·(H_2O)_(12)M_r=2347. 44 , triclinic, P1, a=10. 155 (1), b=10. 286(3) , c=16. 732(9) A, a=96. 50(4), β=87.18(4),γ=108. 99 (1)°, V=1642(4) A ￣3, Z=1, D_c=2. 37 g/cm￣3, F(000)=1160,λ(MoKa)=0. 71069 A, μ=27. 43 cm￣(-1), T= 23℃,final R=0.040 and R_w=0. 058 for 4415 observatives reflections with I≥3σ(I).The title compound contains two (V_(10)O_(28))￣(-6) anions, twelve NH ions and twelve water molecules.The decavanadate anion is an isolated group consisting of ten condensed VO_6 octahedra sharing edges. The anions and the water molecules as well as the cations and the water molecules are connected by the strong hydrogen bonds (the distances are in the range of 2. 758～2. 956 A ).the anions and the cations are connected by the strong hydrogen bonds (2. 720～2. 859A) and the electrostatic force.展开更多
A series of 2-methylpropan-2-aminium O-methyl 1-（substituted phenoxyacetoxy）alkylphosphonates （5a-5o） was selectively synthesized by reacting the corresponding O,O-dimethyl l-（substituted phenoxyacetoxy）-alkylph...A series of 2-methylpropan-2-aminium O-methyl 1-（substituted phenoxyacetoxy）alkylphosphonates （5a-5o） was selectively synthesized by reacting the corresponding O,O-dimethyl l-（substituted phenoxyacetoxy）-alkylphosphonates with an excess of 2-methylpropan-2-amine.The results of preliminary bioassays show that the title compounds exhibit moderate to good herbicidal activities against Brassica napus and Echinochloa crusgalli.Furthermore,compounds 5a-5j,which show much higher activities than compounds 5k-5o,were selected to further evaluate their post-emergence herbicidal activity at a dosage of 150 g/ha（l ha=10000 m2）.Especially,2-methylpropan-2-aminium O-methyl 1-[2-（4-chloro-2-methylphenoxy）acetoxy]butylphosphonate（5h） shows 100％ inhibitory effect on the growth of Brassica juncea and Amaranthus retroflexus,which is comparable with the commercial herbicide 2,4-dichlorophenoxy acetic acid（2,4-D）.展开更多
文摘NH_4)_(12)(V_(10)O_(28))_2·(H_2O)_(12)M_r=2347. 44 , triclinic, P1, a=10. 155 (1), b=10. 286(3) , c=16. 732(9) A, a=96. 50(4), β=87.18(4),γ=108. 99 (1)°, V=1642(4) A ￣3, Z=1, D_c=2. 37 g/cm￣3, F(000)=1160,λ(MoKa)=0. 71069 A, μ=27. 43 cm￣(-1), T= 23℃,final R=0.040 and R_w=0. 058 for 4415 observatives reflections with I≥3σ(I).The title compound contains two (V_(10)O_(28))￣(-6) anions, twelve NH ions and twelve water molecules.The decavanadate anion is an isolated group consisting of ten condensed VO_6 octahedra sharing edges. The anions and the water molecules as well as the cations and the water molecules are connected by the strong hydrogen bonds (the distances are in the range of 2. 758～2. 956 A ).the anions and the cations are connected by the strong hydrogen bonds (2. 720～2. 859A) and the electrostatic force.
基金Supported by the National Basic Research Program of China（No.2010CB126100）, the National Key Technologies R＆D Progaram of China（No.2011BAE06B03）, the National Natural Science Foundation of China（No.21172090） and the Program for Changjiang Scholars and Innovative Research Team in University, China（No.IRT0953）.
文摘A series of 2-methylpropan-2-aminium O-methyl 1-（substituted phenoxyacetoxy）alkylphosphonates （5a-5o） was selectively synthesized by reacting the corresponding O,O-dimethyl l-（substituted phenoxyacetoxy）-alkylphosphonates with an excess of 2-methylpropan-2-amine.The results of preliminary bioassays show that the title compounds exhibit moderate to good herbicidal activities against Brassica napus and Echinochloa crusgalli.Furthermore,compounds 5a-5j,which show much higher activities than compounds 5k-5o,were selected to further evaluate their post-emergence herbicidal activity at a dosage of 150 g/ha（l ha=10000 m2）.Especially,2-methylpropan-2-aminium O-methyl 1-[2-（4-chloro-2-methylphenoxy）acetoxy]butylphosphonate（5h） shows 100％ inhibitory effect on the growth of Brassica juncea and Amaranthus retroflexus,which is comparable with the commercial herbicide 2,4-dichlorophenoxy acetic acid（2,4-D）.
