Thiourea derivatives and their nickel(II) and platinum(II) complexes:: antifungal activity

We have synthesized two thiourea derivatives of methyl anthranilate (1, 2) and their complexes with nickel (3) and platinum(II) (4). We have also prepared the complexes of nickel(II) with two benzoylthiourea derivatives (5, 6). The obtained compounds were characterized by elemental analysis, spectroscopic methods (FT-IR, UV-vis, NMR), mass spectrometry and thermal analysis. Compound 1, C20H23N3O2S, crystallizes in monoclinic space group P21/n, with Z=4, and unit cell parameters. a = 8.8042(4) Angstrom, b = 7.6608(3) Angstrom, c = 28.834(2) Angstrom, alpha=gamma=90degrees, beta=90.94(1)degrees. Compound 2, C20H21N3O3S, crystallizes in monoclinic space group P21/c, with. Z=4. and unit cell parameters, a=7.7345(4) Angstrom, b=8.6715(4) Angstrom, c=29.113(2) Angstrom, alpha=gamma=90degrees, beta=90.67(1)degrees. Compound 5, C24H36N4NiO2S2, crystallizes in monoclinic space group P21/n. with Z=4, and unit cell parameters, a=10.4317(8) Angstrom, b=18.517(2) Angstrom, c- 13.299(1) Angstrom alpha=gamma=90degrees, beta=104.53(1)degrees. Compound 6, C25H28Cl2N4NiO4S2, crystallizes with a molecule of CH2Cl2 in triclinic space group P-1, with Z = 2, and unit cell parameters, a = 10.362(1) Angstrom, b = 11.849(2) Angstrom, c = 12.536(2) Angstrom, alpha=90.04(2)degrees, beta=84.73(1)degrees, gamma=113.43(2)degrees, Compounds I and 2 show antifungal activity against the major pathogens responsible for important plant diseases (Botrytis cinerea, Colletotrichum fragariae, Fusarium oxysporum and Phoma betae). The antifungal activity is practically the same for morpholine and ethyl derivatives. (C) 2001 Elsevier Science Inc. All rights reserved.