the presence of species having one, two, and three co-ordinated phosphine ligands (four in the case of PBun3), and these species exchange with one another at elevated temperatures. The entropies of activation (ΔS‡) for these processes are negative and the mechanism of exchange is thus associative in all cases.
在CD 2 Cl 2溶液中以不同比例研究了[NEt 4 ] [AuBr 2 ]与各种
配体PPhMe 2或PBu n 3的31 P- 1 H} nmr光谱。溶液显示存在具有一,二和三个配位的
膦配体(在PBu n 3的情况下为四个)的物种,并且这些物种在升高的温度下彼此交换。这些过程的激活熵(ΔS ‡)为负,因此交换机制在所有情况下都是关联的。