Study of vibrational frequencies of [Ru(tpy)(azpy)(L)]n+

Study of vibrational frequencies of [Ru(tpy)(azpy)(L)]ⁿ⁺
การศึกษาความถี่ของการสั่นในสารประกอบเชิงซ้อนของ [Ru(tpy)(azpy)(L)]ⁿ⁺

Kanidtha Hansongnern, D. of Chemistry, F. of Sci., PSU.
Uraiwan Saeteaw, Graduate Student, D. of Chemistry, F. of Sci., PSU.
Corresponding e-mail : hkanidth@ratree.psu.ac.th

Grant : Postgraduate Education and Research Program in Chemistry
Presented : The 26th Congress on Science and Technology of Thailand, 18-20 October 2000, Bangkok
Key words : ruthenium complexes, vibrational frequencies, terpyridine

Compounds of the type [Ru(tpy)(azpy)(L)]ⁿ⁺ (where tpy = 2,2' : 6',2"-terpyridine, azpy = 2-(phenylazo)pyridine, L = Cl^- , NO₂^- , NCS^-, py and n = +1 , +2) were prepared according to the modi-fied method. As the results of Infrared spectra of the complexes show that the azpy-azo vibrational frequencies are varied with p-accepting behavior of coligand (L). Comparing spectra of the four compounds, it is observed that N=N (azo) stretching mode in [Ru(tpy)(azpy)(NO₂)]+ occurs at 1,356 cm^-1 (the highest value), whereas that in [Ru(tpy)(azpy)(Cl)]+ occurs at 1,312 cm^-1 (the lowest value). Results from this study corresponded to the ligand field strength of coligand (L) in the spectrochemi-cal series.

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