Palladium(II) and platinum(II) complexes of 2,9-Dimethyl-1,10-phenanthroline. I. Halide compounds

Abstract

Complexes of 2,9-dimethyl-1,10-phenanthroline with palladium(II) and platinum(II) halides are described. The methyl groups of the ligand introduce strong steric hindrance in some of the normal geometries of these transition-metal complexes, and evidence is presented for five- coordination in the bis(dmp) compounds of these two metals.

The Crystal Structure of cis-Chlorobis(triethylphosphine)-1,10-phenanthrolineplatinum(II) fluoroborate, (PtCl(PEt3)2(phen))BF4, a Complex Containing Monodentate 1,10-Phenanthroline

“…3 1 P nuclear magnetic arrangement (1 1. The existence of five coordinate resonance spectra were recorded at 40.5 MHz in dichlorocomplexes of platinum(I1) has also been reported methane solution using H , P o 4 as external reference on on the basis of spectroscopic (2)(3)(4)(5) and X-ray a Varian XL-100 spectrometer with noise decoupling of diffraction (6-7) studies. In view of the rarity of P r~t O s~; e s of Weisanberg and Precession photographs five coordinate platinun~ complexes cveconsidered obtained using ~~~~~~d i~ ~h~ space group it of interest to undertake a crystal structure study P2,/c was established unequivocally from the systematic of (PtCl(phen)(PEt,),)(BF,), since conductance and proton magnetic resonance studies had suggested a five-coordinate structure as the most likely for this complex in solution (8).…”

1H n.m.r. studies of palladium(II) complexes of 2,9-dimethyl-1,10-phenanthroline and 8-hydroxyquinoline

“…In [5], none of the four ligand halves are equivalent, and in [6] there are three distinct chemical and magnetic environments for the halves of each ligand. The proposed structure [7] with the halide atom in the trigonal plane gives rise to two environments and indeed there are only two sets of signals observed in the n.m.r, spectra of the compounds.…”

“…The three possible geometries proposed (7) for these fivecoordinate compounds are shown in [5]- [7]. It should be noticed that [5] imposes the most steric strain of the three structures.…”

Reaction with DNA and pharmacologic activity of 1,10-phenanthroline and electron-rich 1,10-phenanthrocyanine complexes of d-elements

“…It was found that bischelate complexes like [Pd(2,9-Me 2 -phen) 2 X 2 ] exist in solutions as five-coordinate easily dissociating cations [Pd(2,9-Me 2 -phen) 2 X] + [125].…”