Dinuclear complexes of cobalt(II) withN,N′-substituted dithioxamides derived from α-aminoacids

✍ Scribed by Alfonso Castiñeiras; María Consuelo F. Vidal; Rosa Carballo

• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 376 KB
• Volume: 20
• Category: Article
• ISSN: 0340-4285
• DOI: 10.1007/bf00141521

✦ Synopsis

The coordination behaviour of N,N'-bis(1-carboxymethyl)dithioxamide (GLYDTO), N,N'-bis(1-carboxyethyl)dithioxamide (ALADTO), N,N'-bis(1-carboxy-2methylpropyl) dithioxamide (VALDTO) and N,N'-bis(1carboxy-3-methylbutyl)dithioxamide (LEUDTO) has been investigated by isolating and characterizing the dinuclear, neutral cobalt(II) complexes, [C02(L-4H)(H20)2 ] (L=GLYDTO, ALADTO, VALDTO or LEUDTO) and [Co2(L-4H)(H20)6 ] (L = ALADTO or VALDTO). All ligands were characterized by mass, i.r., and ~H-and 13C.n.m.r. spectroscopy. The complexes possess distorted octahedral structures as revealed by the magnetic and electronic (diffuse reflectance) spectral data. The i.r. data indicate that the ligands are bis-tridentate, bis-dianions coordinated to each metal ion through the carboxylate oxygen, deprotonated thioamide nitrogen and thiocarbonyl sulphur atoms.