A new tetranuclear cluster [Co4（bm）6C12]＇（H20）2-（CH3OH） （1, Hbm is （1H-benzi- midazol-2-yl）-methanol） has been synthesized by solvothermal method and structurally determined by IR, elemental analysis, and s...A new tetranuclear cluster [Co4（bm）6C12]＇（H20）2-（CH3OH） （1, Hbm is （1H-benzi- midazol-2-yl）-methanol） has been synthesized by solvothermal method and structurally determined by IR, elemental analysis, and single-crystal X-ray diffraction. Complex 1 belongs to monoclinie space group P21/n with a = 21.1713（5）, b = 12.7948（3）, c = 24.0195（9） А, β = 95.309（3）°, V = 6478.6（3） A3, Z = 4, F（000） = 2568, Dc = 1.289 g.cm-3, Mr = 1257.63,μ= 9.096 mm-I, S = 1.000, the final R = 0.0861 and wR = 0.2552 for 4956 observed reflections with 1 〉 20（/）. Two connected face-sharing cubes are observed in the framework of 1, each with one vertex missing. Complex 1 forms a 2-D network through N-H...O hydrogen bonds. The apparent holes can be observed.展开更多
Solvent extraction of base metals using bis((1-decylbenzimidazol-2-yl)methyl)amine (BDNNN) showed a lack of pH-metric separation of the metals. The extraction system was described quantitatively using the equilibria i...Solvent extraction of base metals using bis((1-decylbenzimidazol-2-yl)methyl)amine (BDNNN) showed a lack of pH-metric separation of the metals. The extraction system was described quantitatively using the equilibria involved to derive the mathematical explanation for the two linear log D vs pHe plots for each metal ion extraction curve, and coordination numbers could also be extracted from the two slopes. The lack of separation was attributed to the absence of stereochemical “tailor making” since the complexes isolated from the reaction of the ligand, bis((1H-benzimidazol- 2-yl)methyl)amine (NNN), with base metals suggested the formation of similar octahedral complex species from spectral and crystal structure evidence. The bis tridentate coordination observed was in agreement with information extracted from the extraction data. This investigation opens up an opportunity and an approach for the evaluation of amines as extractants but cautions against tridentate ligands.展开更多
基金financially supported by the National Natural Science Foundation of China(No.21161006)Program for Excellent Talents in Guangxi Higher Education Institutions(Gui Jiao Ren[2012]41)Program of the first session backbone teacher of Guangxi of China
文摘A new tetranuclear cluster [Co4（bm）6C12]＇（H20）2-（CH3OH） （1, Hbm is （1H-benzi- midazol-2-yl）-methanol） has been synthesized by solvothermal method and structurally determined by IR, elemental analysis, and single-crystal X-ray diffraction. Complex 1 belongs to monoclinie space group P21/n with a = 21.1713（5）, b = 12.7948（3）, c = 24.0195（9） А, β = 95.309（3）°, V = 6478.6（3） A3, Z = 4, F（000） = 2568, Dc = 1.289 g.cm-3, Mr = 1257.63,μ= 9.096 mm-I, S = 1.000, the final R = 0.0861 and wR = 0.2552 for 4956 observed reflections with 1 〉 20（/）. Two connected face-sharing cubes are observed in the framework of 1, each with one vertex missing. Complex 1 forms a 2-D network through N-H...O hydrogen bonds. The apparent holes can be observed.
文摘Solvent extraction of base metals using bis((1-decylbenzimidazol-2-yl)methyl)amine (BDNNN) showed a lack of pH-metric separation of the metals. The extraction system was described quantitatively using the equilibria involved to derive the mathematical explanation for the two linear log D vs pHe plots for each metal ion extraction curve, and coordination numbers could also be extracted from the two slopes. The lack of separation was attributed to the absence of stereochemical “tailor making” since the complexes isolated from the reaction of the ligand, bis((1H-benzimidazol- 2-yl)methyl)amine (NNN), with base metals suggested the formation of similar octahedral complex species from spectral and crystal structure evidence. The bis tridentate coordination observed was in agreement with information extracted from the extraction data. This investigation opens up an opportunity and an approach for the evaluation of amines as extractants but cautions against tridentate ligands.
