Electronic spectra and photophysics of platinum(II) complexes with .alpha.-diimine ligands solid-state effects. 2. Metal-metal interaction in double salts and linear chains

Dynamic scaffold of chiral binaphthol derivatives with the alkynylplatinum(II) terpyridine moiety

“…6 A and B). Interestingly, 2 with the optimum length for a single-turn helical strand shows a switching-off of the monomeric 3 MLCT/ 3 LLCT emission and a more red-shifted 3 MMLCT emission band in CH 3 CN (Fig. S7A), in accordance with the proposition that 2 would form a more stable helical strand with a tighter conformation than 3, as reflected by the more negative ΔG(CH 3 CN) value of 2 than 3.…”

“…Upon increasing the CH 3 CN content, 2 and 3 both show a growth of a low-energy emission band at 685 nm typical of a 3 MMLCT emission with the diminution of the 3 MLCT/ 3 LLCT emission of the monomeric alkynylplatinum(II) terpyridine moiety ( Fig. 6 A and B).…”

“…Complexes 1−3 exhibit strong emission bands in CH 2 Cl 2 at 577−582 nm upon excitation at λ > 400 nm, which are assigned as an excited state of predominantly 3 MLCT/ 3 LLCT character. Upon increasing the CH 3 CN content, 2 and 3 both show a growth of a low-energy emission band at 685 nm typical of a 3 MMLCT emission with the diminution of the 3 MLCT/ 3 LLCT emission of the monomeric alkynylplatinum(II) terpyridine moiety ( Fig.…”

“…Such square-planar platinum(II) complexes have been shown to exhibit interesting and intriguing photophysical properties associated with a tendency to form metal···metal and/or π−π stacking interactions (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). Most of the studies on these platinum(II) polypyridine systems related to the metal···metal interactions are mainly associated with their rich solid-state polymorphism and are confined to that in the study of solid-state spectroscopy and electronic structures (4,8,14).…”

Self-assembly of alkynylplatinum(II) terpyridine amphiphiles into nanostructures via steric control and metal–metal interactions

“…Detailed analysis of temperature-dependent UV-visible absorption spectra of the nanostructured tubular aggregates also provided insights into the assembly mechanism and showed the role of metal−metal interactions in the cooperative supramolecular polymerization of the amphiphilic platinum(II) complexes. noncovalent interactions | platinum complex | nanoaggregates S quare-planar d 8 platinum(II) polypyridine complexes have long been known to exhibit intriguing spectroscopic and luminescence properties (1-54) as well as interesting solid-state polymorphism associated with metal−metal and π−π stacking interactions (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)25). Earlier work by our group showed the first example, to our knowledge, of an alkynylplatinum(II) terpyridine system [Pt(tpy)(C ≡ CR)] + that incorporates σ-donating and solubilizing alkynyl ligands together with the formation of Pt···Pt interactions to exhibit notable color changes and luminescence enhancements on solvent composition change (25) and polyelectrolyte addition (26).…”