I have synthesized a phosphine and thiol co-protected nanocluster. This cluster is soluble in most solvents like DCM,DMF,CHCl3 and also in MeOH. I am not able to crystallize this compound because of the presence of large excess of phosphines. I am not able to remove it from the reaction mixture through solvent extraction as the cluster itself is soluble in most of the solvents. It would be helpful if anyone can help me arrive at a solution for this poroblem.

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