hi,
the original publication : JOMC, 65,253, 1974
Pd(dba)2 is the crude compound obtained from the reaction, which is an equimolecular mixture of Pd(dba)3 and Pd2(dba)3. Pd2(dba)3.solvent is obtained after crystalisation of the mixture, which displace a dba and form just the previous complex.
bye