Photochemistry of platinum phosphine complexes. Perspective in CH bond activation

Photochemistry of tris(pyrazolyl)borate titanium(IV) complexes

“…Since 1 and 2 are formally complexes of the d 0 Ti(IV), the observed bands must represent charge transfer transitions. The longest wavelength p-p* absorption of free and coordinate Tp À and Tp* À ligands appears in the 210-230 nm region [6][7][8]. As the Tp was changed to Tp*, the band showed a red shift, reflecting the increased p donation of the Tp* to the metal d orbitals.…”

C–P vs C–H Bond Cleavage of Triphenylphosphine at Platinum(0): Mechanism of Formation, Reactivity, Redox Chemistry, and NMR Chemical Shift Calculations of a μ-Phosphanido Diplatinum(II) Platform

“…The properties and formation of multinuclear μ-PR 2 structures formed from M(0)-PR 3 precursors have been studied most extensively for platinum but still comparatively little is known regarding the reaction mechanism, which includes the identification of reaction intermediates. As depicted in Scheme , chemoselectivity varies with reaction conditions, and intermediate formation of κ 2 -P,C-chelate M-H complexes through ortho -C–H bond cyclometalation was proposed for Pt − and established for other metals. − In fact, 2-LiC 6 H 4 PPh 2 and derivatives thereof have commonly been used as precursors for the preparation of mononuclear κ 2 -P,C- and dinuclear μ:κ 2 -P,C-chelate compounds of Pt. , …”

Investigation of C–C Bond Activation of sp–sp2 C–C Bonds of Acetylene Derivatives via Photolysis of Pt Complexes

“…Heating to 100°C for 5 h was required to obtain only 3. The reaction was monitored by 31 P NMR spectroscopy, showing a singlet at δ 98.8 with platinum satellites ( 1 J P−Pt = 3060 Hz). Heating 3 to 150°C overnight showed no reaction, but irradiation for 4 h with UV light (λ >300 nm) showed the formation of compound 2.…”

“…Thereafter, another 5 equiv of 2-butyne was added to the solution and the mixture was heated to 70°C overnight. The reaction was monitored by 31 Preparation of (dtbpe)Pt(D)(C 6 D 5 ) (2). A 10 mg amount of 1 was dissolved in 1 mL of C 6 D 6 and placed into a resealable NMR tube with a Teflon stopcock.…”