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1H{15N} GHMQC study of 5,7-diphenyl-1,2,4-triazolo[1,5-a]pyrimidine and 1H, 13C and 15N NMR coordination shifts in Au(III) chloride complexes of 1,2,4-triazolo[1,5-a]pyrimidines

✍ Scribed by Edward Szłyk; Leszek Pazderski; Iwona Łakomska; Lech Kozerski; Jerzy Sitkowski

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
105 KB
Volume
40
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^1^H{^15^N} NMR spectrum of 5,7‐diphenyl‐1,2,4‐triazolo[1,5‐a]‐pyrimidine (3) was measured by GHMQC, unambiguously assigned and compared with the spectra of 1,2,4‐triazolo[1,5‐a]pyrimidine (1) and 5,7‐dimethyl‐1,2,4‐triazolo[1,5‐a]pyrimidine (2). A series of Au(III) chloride complexes of general formula AuLCl~3~, where L = 1, 2, 3, was synthesized and studied by ^1^HH{^15^N} GHMQC and ^1^H{^13^C} GHMBC. Low‐frequency shifts of 72–74 ppm (^15^N) and 5–6 ppm (^13^C) were observed upon complexation by Au(III) ions for the coordination site N‐3 and adjacent C‐2, C‐3a atoms, respectively. The ^13^C signals of C‐5, C‐6, C‐7 and the ^1^H resonances of H‐2, H‐6 were shifted to higher frequency. Comparison with analogous Pd(II), Pt(II) and Pt(IV) complexes revealed that in the case of Au(III) coordination the ^15^N shifts were relatively smaller, whereas those for ^13^C and ^1^H were larger. Copyright © 2002 John Wiley & Sons, Ltd.

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