盐卤硼酸盐化学ⅩⅩⅥ．MgO·2B_2O_3－18％MgCl_2－H_2O产过饱和溶液结晶动力学研究

ＭｇＯ·２Ｂ２Ｏ３－１８％ＭｇＣｌ２－Ｈ２Ｏ过饱和溶液于２０℃恒温静置，其结晶过程分为两个阶段．第一阶段结晶析出三方硼镁石（ＭｇＯ·３Ｂ２Ｏ３·７．５Ｈ２Ｏ），第二阶段析出章氏硼镁石（ＭｇＯ·２Ｂ２Ｏ３·９Ｈ２Ｏ）．未得到多水硼镁石和库水硼镁石．探讨了两种析出团相的结晶机理并拟合出结晶动力学方程．结果表明，两种固相结晶机理均为多核表面反应控制生长．     

盐卤硼酸盐化学ⅩⅩⅥ. MgO·2B2O3－18%MgCl2－H2O产过饱和溶液结晶动力学研究

ＭｇＯ，２Ｂ２Ｏ３－１８％ＭｇＣｌ２－Ｈ２Ｏ过饱和溶液于２０℃恒温静置，其结晶过程分为两个阶段，第一阶段结晶析出三方硼镁石（ＭｇＯ，３Ｂ２Ｏ３，７．５Ｈ２Ｏ）。第二阶段析出章氏硼镁（ＭｇＯ．２Ｂ２Ｏ３．９Ｈ２Ｏ），未得到多水硼镁石和库水硼镁石，探讨了两种析出固相的结晶机理并拟事出结晶动力学方程，结果表明，两个种固相结晶机理场为多核表面反应控制生长。     

Terminal Phosphanido Rhodium Complexes Mediating Catalytic P?P and P?C Bond Formation

Complexes with terminal phosphanido (M PR₂) functionalities are believed to be crucial intermediates in new catalytic processes involving the formation of P P and P C bonds. We showcase here the isolation and characterization of mononuclear phosphanide rhodium complexes ([RhTp(H)(PR₂)L]) that result from the oxidative addition of secondary phosphanes, a reaction that was also explored computationally. These compounds are active catalysts for the dehydrocoupling of PHPh₂ to Ph₂P PPh₂. The hydrophosphination of dimethyl maleate and the unactivated olefin ethylene is also reported. Reliable evidence for the prominent role of mononuclear phosphanido rhodium species in these reactions is also provided.