Cyclometallated nitrogen heterocycles

Understand, elucidate and rationalize the coordination mode of pyrimidylmethylamines: an intertwined study combining NMR and DFT methods

Elucidation of the coordination modes in the pyrimidylmethylamines by NMR and DFT methods.

Synthesis of platinum(II) cyclometallated compounds derived from imines containing pyridyl or pyrimidyl groups

The reaction of compounds [Pt2Me4(µ-SMe2)2] and cis-[PtPh2(SMe2)2] with ligands 4-(2′-C5H4N)C6H4 CHN CH2CH2NMe2 (1a) and 4-(3′,5′-C4H3N2)C6H4CHNCH2CH2NMe2 (1b) carried out in acetone at room temperature produced compounds in which the imines act as bidentate [N,N′] ligands. Analogous compounds could be obtained in refluxing methanol when cis-[PtCl2(DMSO)2] was used as starting material. The corresponding cyclometallation processes leading to platinum(II) compounds with a tridentate [C,N,N′] ligand took place under different reaction conditions, except for metallation of 1a with cis-[PtPh2(SMe2)2], which could not be achieved. All compounds were characterized by usual techniques and [PtMe{4-(3′,5′-C4H3N2)C6H3CHNCH2CH2NMe2}] (3bMe) was also characterized crystallographically.Key words: platinum, imines, pyridyl, pyrimidyl, cyclometallation, crystal structure.