A compound of formula (I): wherein R
1
in each occurrence is independently H or a substituent; R
2
in each occurrence is independently a substituent; p in each occurrence is 0, 1, 2, 3 or 4 and Y is a ligand, with the proviso that at least one R
1
is a substituent or at least one p is at least 1.
公式(I)的化合物:其中,每个R1独立地是H或一个取代基;每个R2独立地是一个取代基;每个p独立地是0、1、2、3或4,Y是一个
配体,条件是至少有一个R1是一个取代基或至少有一个p至少为1。