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Complexes of substituted dipyridylpyridazines with palladium(II) and platinum(II)

“…However, the 1 H-NMR spectral measurements (table 4) indicate that the ligands exist in either the cis-cis or the trans-trans conformation and not only the former, as has been reported [5]. The latter conformation is even more favored since it has less lonepair/lone-pair repulsion.…”

“…We reported earlier [5] that the free ligands may exist in three different conformations as shown below…”

“…The tetranitrogenated 3,6-bis(2 0 -pyridyl)pyridazine (dppn) ligand, which is expected to be a better -acceptor than 2,2 0 -bipyridine (bpy) and 1,10-phenanthroline (phen) [5,6], has been reported to form complexes with Pd(II) and Pt(II) [7]. Such complexes have been used to synthesize bimetallic heteronuclear species [7d].…”

“…Although complexes of Ru(II) [8] and Rh(III) [5] with derivatives (n-dppn, figure 1) of the dppn ligand have been synthesized and characterized, no analogous complexes with Pd(II) and Pt(II) have been reported. The n-dppn ligands are expected to be even better donor than dppn itself due to the presence of the electron-releasing cyclic aliphatic groups [5,8,9].…”

“…The n-dppn ligands are expected to be even better donor than dppn itself due to the presence of the electron-releasing cyclic aliphatic groups [5,8,9].…”