Fluorinated polyether dendritic sectors 4, 7 and 10 from the first to the thirdgenerations, respectively, were prepared by a convergent approach from readily availablepentafluorophenol, phloroglucinol and 1,3-dibromop...Fluorinated polyether dendritic sectors 4, 7 and 10 from the first to the thirdgenerations, respectively, were prepared by a convergent approach from readily availablepentafluorophenol, phloroglucinol and 1,3-dibromopropane. These dendritic sectors have goodsolubility properties and are stable in both acidic and basic media. Hence they are useful dendriticbuilding blocks for the preparation of functional dendrimers.展开更多
The Jurassic high Sr/low Y granitoids in eastern China are characterized by high Sr/Y (27-166) and La/Yb (14-66) ratios, low abundance in Y (6-21μg/g) and Yb (0.5-2.0μg/g), comparable with those of adakites defined ...The Jurassic high Sr/low Y granitoids in eastern China are characterized by high Sr/Y (27-166) and La/Yb (14-66) ratios, low abundance in Y (6-21μg/g) and Yb (0.5-2.0μg/g), comparable with those of adakites defined by Defant et al. Thus, they were recently considered as adakitic rocks by some researchers. Compared with the typical adakites in circum-Pacific margins, however, these high Sr/low Y granitoids have higher K2O (-3.5%) but lower A12O3 (-16.0%) as well as lower Mg#(-38) and δSrN (-1.23) values. Furthermore, they show relatively flat HREE patterns with Y/Yb values of -10 close to the chondritic value. These geochemical characteristics indicate a residue mineral assemblage of hornblende, garnet and plagioclase for these high Sr/low Y granitoids melt. Thus, they were generated by partial melting at 9-13 kbar (30-45 km in depth), similar to the Archaean high-Al TTG rather than the modern adakites. Generation of these high Sr/low Y granitoids cannot be considered as evidence for a thickened展开更多
文摘Fluorinated polyether dendritic sectors 4, 7 and 10 from the first to the thirdgenerations, respectively, were prepared by a convergent approach from readily availablepentafluorophenol, phloroglucinol and 1,3-dibromopropane. These dendritic sectors have goodsolubility properties and are stable in both acidic and basic media. Hence they are useful dendriticbuilding blocks for the preparation of functional dendrimers.
基金This work was supported by the Chinese Academy of Sciences (Grant No. KZCX2-102)the National Natural Science Foundation of China (Grant No. 49725309).
文摘The Jurassic high Sr/low Y granitoids in eastern China are characterized by high Sr/Y (27-166) and La/Yb (14-66) ratios, low abundance in Y (6-21μg/g) and Yb (0.5-2.0μg/g), comparable with those of adakites defined by Defant et al. Thus, they were recently considered as adakitic rocks by some researchers. Compared with the typical adakites in circum-Pacific margins, however, these high Sr/low Y granitoids have higher K2O (-3.5%) but lower A12O3 (-16.0%) as well as lower Mg#(-38) and δSrN (-1.23) values. Furthermore, they show relatively flat HREE patterns with Y/Yb values of -10 close to the chondritic value. These geochemical characteristics indicate a residue mineral assemblage of hornblende, garnet and plagioclase for these high Sr/low Y granitoids melt. Thus, they were generated by partial melting at 9-13 kbar (30-45 km in depth), similar to the Archaean high-Al TTG rather than the modern adakites. Generation of these high Sr/low Y granitoids cannot be considered as evidence for a thickened
