The First Metal Complexes of 4,6-diamino-1-hydro-5-hydroxy-pyrimidine-2-thione: Preparation, Physical and Spectroscopic Studies, and Preliminary Antimicrobial Properties

Table 1

Diagnostic¹H NMR (𝛿,ppm)^a spectral data for LH and the representative complexes 1, 3, 4, and 6–8 in DMSO-d₆.

Compound	–N(1)H–	–N(4)H2/–N(6)H2	–O(5)H
LH	7.43	6.07, 6.18	9.13
1	7.57	6.18, 6.55	—
3	7.49	6.14, 6.47	—
4	7.44	6.20, 6.49	—
6	b	6.11, 6.47	—
7	7.47	6.17, 6.48	—
8	7.39	6.08, 6.46	—

^aThe spectra were run 10–15 min after dissolution.
^bObscured by the signals of the aromatic protons.