Photophysics of bis(ethylxanthato)nickel(II) [Ni(EtOCS2)2] complex studied by femtosecond pump-probe spectroscopy

Femtosecond spectroscopy was applied to study the ultrafast relaxation dynamics for the excited state of xanthogenate Ni(S2COEt)2 complex in acetonitrile and CCl4. The radiation of second harmonic (400 nm) of Ti:Sapphire laser transfers the Ni(S2COEt)2 complex to excited LMCT state which in CCl4 with time 0.76 ps decays to excited triplet state of (d,d*) type. With the time 6.8 ps the triplet state undergoes vibrational relaxation and then it slowly decays during 550 ps to the ground state. In acetonitrile the processes of relaxation after femtosecond excitation follow the same pathway with a close times.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Excitation of Ni(xan)2 complex in CCl4 leads to 0.6 ps relaxation to triplet state. ► Triplet state undergoes vibrational cooling and slowly decays to the ground state. ► In acetonitrile the processes follow the same pathway with a close times.