Dear Krishnamoorthy Periasamy many thanks for your interesting technical question. Certainly a few details about the interactions in such materials can be studied using e.g. FTIR and Raman spectroscopy. However, when it comes to a final proof, nothing beats single-crystals X-ray diffractions studies. If at all possible, I would always try to grow single-crystals and then seek the collaboration with a colleague at another institution who has access to X-ray facilities.
In this context please have a look e.g. the following typical research article:
Growth and characterization of pure and metal doped bis(thiourea) zinc chloride single crystals
Article Growth and characterization of pure and metal doped bis(thio...
X-ray absorption spectroscopy (EXAFS and XANES) is well suited for this question: The methods are element - sensitive, and since the method is probing the local atomic environment of the element of interest, it is exactly what you need. You even do not need a single-X-tal sample, and even liquids are feasible. The disadvantage is that you'll need a synchrotron or a tuneable X-ray source ... Don't hesitate to come back if you need further help or assistance, Dirk