The present invention provides solution to the problem involved in delivery of active molecules to nucleus. More particularly, the invention provides intrinsically fluorescent and inherently surface functionalized carbon nanospheres which are non-toxic. Also, these carbon nanospheres [CSP] were adsorbed with CTPB [CSP-CTPB] and the adsorbed CSP-CTPB are permeable to cells with nuclear targeting ability. In addition, the present invention provides a composition, a process to prepare the composition comprising CSP with adsorbed active/therapeutic molecules. Further, the instant invention provides a method for delivering active molecules inside a cell nucleus.
