A trinudear Mn（II） coordination complex Mna （HEDTA）2-10H20 （EDTA=ethylene diamine tetraacetic acid） 1 has been synthesized and characterized by X-ray crystal structure determination. In addition, IR spectrum, th...A trinudear Mn（II） coordination complex Mna （HEDTA）2-10H20 （EDTA=ethylene diamine tetraacetic acid） 1 has been synthesized and characterized by X-ray crystal structure determination. In addition, IR spectrum, thermogravimetric analysis, electron paramagnetic resonance （EPR） spectra and magnetic susceptibility of this complex are discussed. X-ray determination indicates that six- and seven-coordinate modes between Mn（Yl） and H4EDTA exist alternately in 1. Furthermore, detailed discussion of magnetic ordering in tile temperature range of 2-300 K reveals the antiferromagnetic interactions in the complex.展开更多
Crystal structure of pyridine-2,6-dicarboxylate(dipc) vanadium complex:[(dipc)VO_2]_2( 4, 4'-bipyridine)·4H_2O(M_r=724.34) is monoclinic with space group C2/c and a=25.857(8),b=6.896(1),c=16.267(5),β=106.27(...Crystal structure of pyridine-2,6-dicarboxylate(dipc) vanadium complex:[(dipc)VO_2]_2( 4, 4'-bipyridine)·4H_2O(M_r=724.34) is monoclinic with space group C2/c and a=25.857(8),b=6.896(1),c=16.267(5),β=106.27(4)°,V=2784.62 D_c=1.73 g/cm￣3,F(000)=1472,Z=4.The structural solutions and refinements based on 1661 reflections (I>2σ(I))converged at R=0. 043.The coordinated number of vanadium atom is 5,the geometrical form of the five atoms are coordinated to the vanadium atom is a distorted tetragonal bipyramid of which the four coordinated atoms O(3),O(5),N(1) and O(2) make up the equatorial plane,while the other coordinated atom O(1) is to occupy the apex.展开更多
The crystal structure of the title compound N,N-bisphenyl-3,6-diethyl-1,4- dihydro-s-tetrazine-1,4-dicarbonamide (C20H22N6O2, Mr = 378.44) has been prepared and determi- ned by single-crystal X-ray diffraction. The cr...The crystal structure of the title compound N,N-bisphenyl-3,6-diethyl-1,4- dihydro-s-tetrazine-1,4-dicarbonamide (C20H22N6O2, Mr = 378.44) has been prepared and determi- ned by single-crystal X-ray diffraction. The crystal is of orthorhombic, space group Pbca with a = 16.287(2), b = 11.347(4), c = 20.975(4) ? V = 3876.4(16) ?, Z = 8, Dc = 1.297 g/cm3, F(000) = 1600, m = 0.088 mm-1, MoKa radiation (l = 0.71073 ?. The structure was refined to R = 0.0337 and wR = 0.1038 for 1952 observed reflections with I > 2s(I). X-ray diffraction analysis reveals that two amide groups are located at the 1 and 4 positions, and the tetrazine ring itself shows a boat conformation.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.20490210,10574047)the Doctor Foundation of China(Grant No.20030487003)
文摘A trinudear Mn（II） coordination complex Mna （HEDTA）2-10H20 （EDTA=ethylene diamine tetraacetic acid） 1 has been synthesized and characterized by X-ray crystal structure determination. In addition, IR spectrum, thermogravimetric analysis, electron paramagnetic resonance （EPR） spectra and magnetic susceptibility of this complex are discussed. X-ray determination indicates that six- and seven-coordinate modes between Mn（Yl） and H4EDTA exist alternately in 1. Furthermore, detailed discussion of magnetic ordering in tile temperature range of 2-300 K reveals the antiferromagnetic interactions in the complex.
文摘Crystal structure of pyridine-2,6-dicarboxylate(dipc) vanadium complex:[(dipc)VO_2]_2( 4, 4'-bipyridine)·4H_2O(M_r=724.34) is monoclinic with space group C2/c and a=25.857(8),b=6.896(1),c=16.267(5),β=106.27(4)°,V=2784.62 D_c=1.73 g/cm￣3,F(000)=1472,Z=4.The structural solutions and refinements based on 1661 reflections (I>2σ(I))converged at R=0. 043.The coordinated number of vanadium atom is 5,the geometrical form of the five atoms are coordinated to the vanadium atom is a distorted tetragonal bipyramid of which the four coordinated atoms O(3),O(5),N(1) and O(2) make up the equatorial plane,while the other coordinated atom O(1) is to occupy the apex.
基金the NNSFC (No. 20272053) and Science and Technology Bureau (011101937) of Zhejiang province
文摘The crystal structure of the title compound N,N-bisphenyl-3,6-diethyl-1,4- dihydro-s-tetrazine-1,4-dicarbonamide (C20H22N6O2, Mr = 378.44) has been prepared and determi- ned by single-crystal X-ray diffraction. The crystal is of orthorhombic, space group Pbca with a = 16.287(2), b = 11.347(4), c = 20.975(4) ? V = 3876.4(16) ?, Z = 8, Dc = 1.297 g/cm3, F(000) = 1600, m = 0.088 mm-1, MoKa radiation (l = 0.71073 ?. The structure was refined to R = 0.0337 and wR = 0.1038 for 1952 observed reflections with I > 2s(I). X-ray diffraction analysis reveals that two amide groups are located at the 1 and 4 positions, and the tetrazine ring itself shows a boat conformation.
