Question

[Ru(bpy)3]2+ can undergo chemical electron transfer reaction and emit light which is known as chemiluminescence.

The chemical reaction that produces the chemiluminescence in this demonstration involves the reduction of Ru(bpy)32+and ammonium persulphate [(NH4)2S2O8] by magnesium metal.

[Ru(bpy)3]2+ + e- [Ru(bpy)3]+ (1) S2O82- + e- SO42- + SO4 (2)

Production of the electronic excited-state complex occurs via an electron-transfer reaction involving the strong oxidant SO4•- that is produced as an intermediate in reaction (2), where *Ru(bpy)32+ is the excited state species able to emit light.

[Ru(bpy)3]+ + SO4 [Ru(bpy)3]2+* + SO42- (3)

The Chemiluminescence would not occur is Mg metal was absent. Explain the role of the Mg metal in this process.

Answer 1

strong chemiluminicense band will not appear without intersytem crossing of Mg from triplet state to singlet state.

Mg metal is essential to proceed above reaction.check the reaction in image.

山 Cheniluminescence ooeloccu Fiom Mg Mejel or tma ly in du ced in kercyst lem Cross /2 o when acce unthforSphn convent akeh gen aa .So a ppear from fuis Reacim