Synthesis, structures and spectroscopic properties of platinum complexes containing orthometalated 2-phenylpyridine

Synthesis, structures and spectroscopic properties of cyclometalated tri-tert-butylphosphine complexes of platinum(II)

“…Thus, the bonds trans to the phosphine ligands are slightly shorter than those trans to the carbon atom. All the four PteN distances are, however, in conformity with those reported for pyrazolate-bridged platinum complexes [10,30,32,50,51]. The Pt/Pt separation (3.547 A) is the longest reported so far in binuclear pyrazolate-bridged platinum complexes (2.8343e3.3763 A) [10,32,50,51].…”

“…Attempts to separate these isomers either by recrystallization or by column chromatography were unsuccessful. It is worth noting that the reaction of [Pd 2 (m-Cl) 2 (Me 2 NCH 2 C 6 H 4 (o)-N,C) 2 ] with pySH yields a binuclear complex stabilized by SN bridges [11], while the reaction of [Pt 2 (m-Cl) 2 (ppy) 2 ] (ppy ¼ 2-C 6 H 4 eC 5 H 4 N) with Pb(Spy) 2 readily afforded a Pt(III) complex, [Pt 2 Cl 2 (mSpy) 2 (ppy) 2 ] [10].…”

“…However, the solid-state structure (see later) revealed a monomeric species with chelating 1,1-dithiolate group. The 1,1-dithiolate complexes of palladium and platinum with metalated nitrogen and phosphorus ligands have been described in literature [10,41] (17) [10])) the solid-state structure prevails in solution. These complexes have four-(dithiolate) and five-(metalated ligand) membered chelate rings.…”

“…Depending on the nature of E, incoming ligand and the metal atom, structural diversity in the resulting complexes is not uncommon [2]. For instance, the reaction of [Pt 2 (m-Cl) 2 (ppy) 2 ] (ppy ¼ 2-C 6 H 4 eC 5 H 4 N) with pyEH (E ¼ O or S) yields readily platinum(III) complexes, [Pt 2 Cl 2 (m-Epy) 2 (ppy) 2 ] [10], but a similar reaction of [Pd 2 (m-Cl) 2 (Me 2 NCH 2 C 6 H 4 -o) 2 ] with pySH affords a binuclear complex, [Pd 2 (m-Spy) 2 (Me 2 NCH 2 C 6 H 4 -o) 2 ] [11]. Most of the substitution reactions have been investigated on binuclear complexes containing five-membered metalated ligands and quite often with E ¼ nitrogen donor atom.…”

“…[Pt 2 (m-pz) 2 (thpy) 2 ] (thpy ¼ C 4 H 2 SeC 5 H 4 N) [50], [Pt 2 (m-pz) 2 (ppy) 2 ] [10]. The two mean square planes of platinum atom inclined with the base of the boat i.e.…”