Divalent β-diketiminate lanthanide complexes LYbR(THF)(L={(2,6-Me2C6H3)NC(Me)}2CH;R=C9H7(1),CH3C5H4(2),OC6H2-But2-2,6-Me-4(32))were synthesized by reducing the mixed-ligand trivalen(t) β-diketimina...Divalent β-diketiminate lanthanide complexes LYbR(THF)(L={(2,6-Me2C6H3)NC(Me)}2CH;R=C9H7(1),CH3C5H4(2),OC6H2-But2-2,6-Me-4(32))were synthesized by reducing the mixed-ligand trivalen(t) β-diketiminate ytterbium chlorides synthesized in situ with Na-K alloy.These divalent lanthanide complexes exhibit good catalytic activity for the ring opening polymerization of ε-caprolactone.展开更多
Reaction of the β-diketiminate ytterbium dichloride LYbCl2(THF)2(L=2,6-Pri2C6H3)NC(Me)CHC(Me)N(C6H3-2,60Pri2)(1)with 2equiv off C5H5Na in THF gave rise to the title complex LYb(C5H5)2(2),and the cryst...Reaction of the β-diketiminate ytterbium dichloride LYbCl2(THF)2(L=2,6-Pri2C6H3)NC(Me)CHC(Me)N(C6H3-2,60Pri2)(1)with 2equiv off C5H5Na in THF gave rise to the title complex LYb(C5H5)2(2),and the crystal structure of the complex 2 was determined by single-crystal X-ray diffraction.The crystal belongs to orthorhombic,space group P21212 with a=4.3219(6),b=1.6602(2),c=0.9604(1)nm,V=6.891(2)nm3,Z=8,Dc=1.390 Mg·m-3,R=0.0331,wR=0.0535.In the molecular structure of the title complex,the central metal atom Yb is coordinated by two cyclopentadienyl rings and two nitrogen atomes of β-diketiminate group to form an eight-coordinate distorted tetrahedral geometry.展开更多
目的研究16-妊娠双烯醇酮脂质体冻干制剂制备的处方工艺,并对其质量进行评价。方法采用薄膜分散-超声法结合冷冻干燥技术制备16-妊娠双烯醇酮脂质体冻干制剂,通过单因素实验和正交设计实验筛选最佳处方和工艺,并进行初步质量评价。结果...目的研究16-妊娠双烯醇酮脂质体冻干制剂制备的处方工艺,并对其质量进行评价。方法采用薄膜分散-超声法结合冷冻干燥技术制备16-妊娠双烯醇酮脂质体冻干制剂,通过单因素实验和正交设计实验筛选最佳处方和工艺,并进行初步质量评价。结果最佳处方工艺为:卵磷脂PC-98T用量为6.5%(W/V),卵磷脂PC-98T与胆固醇硫酸钠的质量比为4∶1,水化温度为60℃,超声时间2 min,最佳冻干保护剂为7.5%葡萄糖。所制冻干制剂平均粒径(121.3±48.7)nm,Zeta电位-41.9 m V,包封率(98.7±0.1)%。结论该方法制备的16-妊娠双烯醇酮脂质体冻干制剂处方合理,工艺可行,稳定性好。展开更多
文摘Divalent β-diketiminate lanthanide complexes LYbR(THF)(L={(2,6-Me2C6H3)NC(Me)}2CH;R=C9H7(1),CH3C5H4(2),OC6H2-But2-2,6-Me-4(32))were synthesized by reducing the mixed-ligand trivalen(t) β-diketiminate ytterbium chlorides synthesized in situ with Na-K alloy.These divalent lanthanide complexes exhibit good catalytic activity for the ring opening polymerization of ε-caprolactone.
文摘Reaction of the β-diketiminate ytterbium dichloride LYbCl2(THF)2(L=2,6-Pri2C6H3)NC(Me)CHC(Me)N(C6H3-2,60Pri2)(1)with 2equiv off C5H5Na in THF gave rise to the title complex LYb(C5H5)2(2),and the crystal structure of the complex 2 was determined by single-crystal X-ray diffraction.The crystal belongs to orthorhombic,space group P21212 with a=4.3219(6),b=1.6602(2),c=0.9604(1)nm,V=6.891(2)nm3,Z=8,Dc=1.390 Mg·m-3,R=0.0331,wR=0.0535.In the molecular structure of the title complex,the central metal atom Yb is coordinated by two cyclopentadienyl rings and two nitrogen atomes of β-diketiminate group to form an eight-coordinate distorted tetrahedral geometry.
文摘目的研究16-妊娠双烯醇酮脂质体冻干制剂制备的处方工艺,并对其质量进行评价。方法采用薄膜分散-超声法结合冷冻干燥技术制备16-妊娠双烯醇酮脂质体冻干制剂,通过单因素实验和正交设计实验筛选最佳处方和工艺,并进行初步质量评价。结果最佳处方工艺为:卵磷脂PC-98T用量为6.5%(W/V),卵磷脂PC-98T与胆固醇硫酸钠的质量比为4∶1,水化温度为60℃,超声时间2 min,最佳冻干保护剂为7.5%葡萄糖。所制冻干制剂平均粒径(121.3±48.7)nm,Zeta电位-41.9 m V,包封率(98.7±0.1)%。结论该方法制备的16-妊娠双烯醇酮脂质体冻干制剂处方合理,工艺可行,稳定性好。