The fullerene complexes, η2-C70[RhCl(CO)(PPh3)2]n(n=1, 2), have been prepared by the reaction of C70 with RhCl(CO)(PPh3)2 in methylbenzene at room temperature. The new complexes were characterized by UV-Vis...The fullerene complexes, η2-C70[RhCl(CO)(PPh3)2]n(n=1, 2), have been prepared by the reaction of C70 with RhCl(CO)(PPh3)2 in methylbenzene at room temperature. The new complexes were characterized by UV-Vis spectra, IR, XPS and elemental analysis. The results show that the complexes of η2 form can be formed by RhCl(CO)(PPh3)2 bonding to C70 in theσ-π way. In addition, the complexes structures have been supposed.展开更多
西藏当雄错盐湖是一个碱性的富锂、硼资源盐湖,对其碳酸盐沉积物的研究有助于了解盐湖形成过程中沉积环境的变化以及锂、硼资源的富集过程。为此,本文从当雄错盐湖碳酸盐剖面自上而下采集了31件样品。对这些样品开展了铀系年龄、XRD、主...西藏当雄错盐湖是一个碱性的富锂、硼资源盐湖,对其碳酸盐沉积物的研究有助于了解盐湖形成过程中沉积环境的变化以及锂、硼资源的富集过程。为此,本文从当雄错盐湖碳酸盐剖面自上而下采集了31件样品。对这些样品开展了铀系年龄、XRD、主-微量元素、碳-氧同位素测定以及介形类的鉴定分析。铀系年龄结果表明剖面沉积开始于(3788±120)a BP,结束于约2220 a BP。碳酸盐沉积的微量元素和稀土元素特征表明,其沉积水体为缺氧、还原环境下的咸水环境,沉积物形成于干旱、寒冷的气候环境,湖泊水体具有半开放-半封闭性质,但封闭程度较高。约3430 a BP时,当雄错水体盐度发生了较大改变。结合沉积物中介形类Candona gyrongensis的出现和沉积物的碳氧同位素特征,推测有地下淡水注入导致湖泊水体变淡和还原性减弱。当雄错水体的盐度在2220 a BP之前仍相对较低,湖水浓缩达到盐湖阶段的时间在2220 a BP以后。展开更多
文摘The fullerene complexes, η2-C70[RhCl(CO)(PPh3)2]n(n=1, 2), have been prepared by the reaction of C70 with RhCl(CO)(PPh3)2 in methylbenzene at room temperature. The new complexes were characterized by UV-Vis spectra, IR, XPS and elemental analysis. The results show that the complexes of η2 form can be formed by RhCl(CO)(PPh3)2 bonding to C70 in theσ-π way. In addition, the complexes structures have been supposed.
文摘西藏当雄错盐湖是一个碱性的富锂、硼资源盐湖,对其碳酸盐沉积物的研究有助于了解盐湖形成过程中沉积环境的变化以及锂、硼资源的富集过程。为此,本文从当雄错盐湖碳酸盐剖面自上而下采集了31件样品。对这些样品开展了铀系年龄、XRD、主-微量元素、碳-氧同位素测定以及介形类的鉴定分析。铀系年龄结果表明剖面沉积开始于(3788±120)a BP,结束于约2220 a BP。碳酸盐沉积的微量元素和稀土元素特征表明,其沉积水体为缺氧、还原环境下的咸水环境,沉积物形成于干旱、寒冷的气候环境,湖泊水体具有半开放-半封闭性质,但封闭程度较高。约3430 a BP时,当雄错水体盐度发生了较大改变。结合沉积物中介形类Candona gyrongensis的出现和沉积物的碳氧同位素特征,推测有地下淡水注入导致湖泊水体变淡和还原性减弱。当雄错水体的盐度在2220 a BP之前仍相对较低,湖水浓缩达到盐湖阶段的时间在2220 a BP以后。