hi! i have some strange by-product, intermediate, or something... i prepared inorganic complex, and it is contaminated ith something (have problems with purification), when i measure platinum NMR, i can observe signal of my product (which should be yellow), but it is yellowish and white (or white-beige). How could i determine, what is inside, beside my product? could Electrospray measurement help me (ESI-MS)? as far as i know, it can tell you if you have some desired compound structure, but what if it is a mixture? is there any technique to analise what is my product?

Depending on the nature of product, LC or GS/MS can help looking at number and type of products you may have gotten. The LC/GC parts takes care of separation.

You probably don't want to do LC or GC with metal complexes. ESI might help. I would certainly try that if you can. Could you give more information on what you are doing? It might help us identify potential products.