The interaction between [Pt(µ-Cl)(Safrole-1H)]2  and 1,3-diisopropylbenzimidazolium bromide  in the presence of Ag2O

Nguyen Thi Mai; Pham Thi Minh Thao; Nguyen Thi Thanh Chi

doi:10.15625/2525-2518/58/6/15245

Author affiliations

Authors

Nguyen Thi Mai Faculty of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Ha Noi, Viet Nam
Pham Thi Minh Thao Faculty of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Ha Noi, Viet Nam
Nguyen Thi Thanh Chi Faculty of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/58/6/15245

Keywords:

Pt(II) complex, safrole, 1, 3-diisopropylbenzimidazol-2-ylidene, XRD, 1H NMR spectra.

Abstract

The interaction of the dimeric complex [Pt(µ-Cl)(Saf)]₂ (1) (Saf: deprotonated safrole) with the salt ⁱPr₂-bimy·HBr in the presence of Ag₂O in acetone solvent was studied. The obtained products were mixed complexes of [PtCl(Saf)(ⁱPr₂-bimy)] (2) and [PtBr(Saf)(ⁱPr₂-bimy)] (3) with different molar ratio (P_I, P_II, P_III) depended on the used molar ratio of 1:salt:Ag₂O. In the case of this ratio being 1:2:1.1, the mixture P_Iwith 75% for the complex 2 was obtained. When concentration of the salt was increased, the product was P_IIwith the molar ratio of 2 : 3 of 1 : 3. However, when both the salt and Ag₂O were increased at the same time, 2 and 3 in P_III had equal molar proportions. The two main factors affecting the 2 : 3 molar ratio are the different solubility of AgCl and AgBr and the different coordinating ability of Cl^- and Br^- ligands. The structure of 2 and 3 was determined by ¹H NMR spectra and single crystal X-ray diffraction. The results reveal that Saf in 2 and 3 coordinates with Pt(II) via C=C_olefinicand C5 of benzene ring. Meanwhile, ⁱPr₂-bimy coordinates with Pt(II) through C_NCN and is in trans-position compared with the C=C_olefinic bond.

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