reagents were received from sigma aldrich chemical co. ( bangalore , karnataka , india ) and used without further purification . solvents were purchased from commercial sources from hyderabad , telangana , indiabased companies and purified by reported protocols . h and c  nmr spectra were recorded on bruker 300  mhz and 500  mhz machines and calibrated against tetramethylsilane ( tms ) . mass spectrometric data were acquired by an electrospray ionization ( esi ) technique on a qtofmicro quadruple mass spectrometer . the stock solutions ( 110 
 m ) of ndin and ndina were prepared in chcl3 . an aliquot of it was transferred to various ratios of chcl3/mch in different volumetric flasks ( final volume of 2  ml ) and allowed to equilibrate for 2  h prior to the uv / vis absorption measurements . all experiments were performed upon excitation at 350  nm in a quartz cell with a 1  cm path length . the stock solutions were prepared in a similar manner as for the absorption study and employed for emission measurements . the stock solutions were prepared in chcl3 in a similar manner as for the uv / vis study . sem images of ndin and ndina were recorded on an fei nova nanosem ( hillsboro , or usa ) operating at high vacuum . for sem imaging , the samples of ndia and ndina were sputtercoated with gold for 10  s at 0.016  ma ar plasma after dropcasting the solutions on glass coverslip and solvent evaporation at rt . tem samples were prepared by the paper blotting method followed by solvent evaporation on a holey carboncoated copper grid . the liquid sample in chcl3/mch ( 5:95 , v / v ) was dropcasted and solvent was allowed to evaporate on the surface naturally . reagents were received from sigma aldrich chemical co. ( bangalore , karnataka , india ) and used without further purification . solvents were purchased from commercial sources from hyderabad , telangana , indiabased companies and purified by reported protocols . h and c  nmr spectra were recorded on bruker 300  mhz and 500  mhz machines and calibrated against tetramethylsilane ( tms ) . mass spectrometric data were acquired by an electrospray ionization ( esi ) technique on a qtofmicro quadruple mass spectrometer . the stock solutions ( 110 
 m ) of ndin and ndina were prepared in chcl3 . an aliquot of it was transferred to various ratios of chcl3/mch in different volumetric flasks ( final volume of 2  ml ) and allowed to equilibrate for 2  h prior to the uv / vis absorption measurements . all experiments were performed upon excitation at 350  nm in a quartz cell with a 1  cm path length . the stock solutions were prepared in a similar manner as for the absorption study and employed for emission measurements . the stock solutions were prepared in chcl3 in a similar manner as for the uv / vis study . sem images of ndin and ndina were recorded on an fei nova nanosem ( hillsboro , or usa ) operating at high vacuum . for sem imaging , the samples of ndia and ndina were sputtercoated with gold for 10  s at 0.016  ma ar plasma after dropcasting the solutions on glass coverslip and solvent evaporation at rt . tem samples were prepared by the paper blotting method followed by solvent evaporation on a holey carboncoated copper grid . the liquid sample in chcl3/mch ( 5:95 , v / v ) was dropcasted and solvent was allowed to evaporate on the surface naturally . as a service to our authors and readers , this journal provides supporting information supplied by the authors . such materials are peer reviewed and may be reorganized for online delivery , but are not copyedited or typeset . technical support issues arising from supporting information ( other than missing files ) should be addressed to the authors .