1H{15N} heteronuclear correlation and 15N cross-polarized magic angle spinning NMR studies of the coordination modes in Zn(II) chloride complexes with purine and methylpurines

The 1 H{ 15 N} heteronuclear correlation and 15 N cross-polarized magic angle spinning NMR spectra of purine ( 1 ) were measured. The Zn(II) chloride complexes with 1 , 7-methylpurine ( 2 ) and 9-methylpurine ( 3 ) were synthesised and studied by analytical methods, far-IR and 15 N NMR. The formulae of ZnL 2 Cl 2 (L= 1 ) and [ZnLCl 2 ] n (L= 2 , 3 ) were found. The formation of Zn(II)N coordination bonds resulted in 3–15 ppm low-frequency shifts of the respective 15 N NMR signals: N-7 for 1 ; N-1, N-9 for 2 ; N-1, N-7 for 3 .