Abstract
Coordinative behavior of the di-(2-pyridyl)hydroxymethane (1) and di-(2-pyridyl)-2- pyridylsulfanylmethane (2) ligands towards Pd(II) and Pt(II) is described. The compounds 3-5 were characterized by IR, mass spectrometry and NMR spectroscopy. Crystal structures of (Pt{(C5H4N)2CH(OH)}Cl2) 3 and (Pd{(C5H4N)2CH(2-C5H4NS)}Cl2) 4 as DMSO solvates displayed the formation of neutral mononuclear complexes. In the complexes 3 and 4 is observed the formation of six-membered chelate rings. The local geometry of the metallic atoms can be described as square planar in the title complexes.
Highlights
We described the synthesis of complexes of Li(I)[19] and Pd(II)[20] and the formation of five-membered rings by the use of the di(2-pyridyl)-N-methylimine ligand; the formation of these rings has been attributed to the rigidity
Continuing with our research, here we report the coordinative behavior of the flexible dipyridines 1 and 2 towards heavier tenth group Pd(II) and Pt(II) metals
Synthesis of ligands 1 and 2 Di-(2-pyridyl)hydroxymethane 1 was synthesized from the reduction of the di-(2pyridyl)ketone.[21]
Summary
Several nitrogenated heterocyclic compounds as dipyridines have been widely used in coordination chemistry.[1,2,3,4,5,6] These compounds act as versatile ligands towards transition metals which yield five- and six-membered chelate rings in a bidentate coordination mode[7,8,9,10,11,12,13,14,15,16] Synthesis of compounds containing five-membered rings can be envisaged by the use of bipyridine (unbridged) derivatives (Ia, Figure 1).[7, 8] When the dipyridinic ligands have flexible bridging groups as methylene, hydroxymethyl, amine, hydrazone and amide groups, they mainly form sixmembered rings (Ib).[9,10,11,12,13,14,15,16] In other dipyridines with less flexible bridging groups, the formation of five-membered rings (Ic) has been reported.[17, 18] Recently, we described the synthesis of complexes of Li(I)[19] and Pd(II)[20] and the formation of five-membered rings by the use of the di(2-pyridyl)-N-methylimine ligand; the formation of these rings has been attributed to the rigidity of the C=N iminic bond. Synthesis of palladium(II) and platinum(II) complexes 3-5 Complexes 3-5 were synthesized from the reaction of 1 and 2 with PdCl2 or PtCl2 in equimolar ratio in hot acetonitrile, see Scheme 2. NMR Spectra 1H and 13C NMR data and the atom numbering for compounds 2, 3, 4 and 5 are showed in Table
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
