Showing papers by "M. Teresa Moreno published in 2010"
TL;DR: Complex 1 was found to co-crystallize in two distinct pseudopolymorphs: a red form, which exhibits an infinite 1D-chain ([1](infinity)) and a yellow form,which contains discrete dimers ([1]), both stabilized by interplanar pi...pi (bzq) and short Pt...Pt bonding interactions.
Abstract: [Pt(bzq)Cl(CNR)] [bzq = benzoquinolinate; R = tert-butyl (tBu 1), 2-6-dimethylphenyl (Xyl 2), 2-naphthyl (2-Np 3)] complexes have been synthesized and structurally and photophysically characterized. 1 was found to co-crystallize in two distinct pseudopolymorphs: a red form, which exhibits an infinite 1D-chain ([1]∞) and a yellow form, which contains discrete dimers ([1]2), both stabilized by interplanar π···π (bzq) and short Pt···Pt bonding interactions. Complex 3, generated through the unexpected garnet-red double salt isomer [Pt(bzq)(CN-2-Np)2][Pt(bzq)Cl2] 4, crystallizes as yellow Pt···Pt dimers ([3]2), while 2 only forms π···π (bzq) contacting dimers. Their electronic absorption and luminescence behaviors have been investigated. According to Time-Dependent Density Functional Theory (TD-DFT) calculations, the lowest-lying absorption (CH2Cl2) has been attributed to combined 1ILCT and 1MLCT/1ML′CT (L = bzq, L′ = CNR) transitions, the latter increasing from 1 to 3. In solid state, while the yellow form [1...
119 citations
TL;DR: In this paper, the chemistry of homo and heteropolynuclear platinum complexes containing bridging ligands with special emphasis in synthetic routes, structural aspects and photoluminescence properties is described.
99 citations
TL;DR: Electrical, spectroelectrochemical, and theoretical studies have been carried out to elucidate the effect produced by the interaction of the Tl(+) with the Pt-C≡CFc fragments, revealing that neutralization of the anionic fragments increases the stability of the fully oxidized species.
Abstract: A series of heteropolynuclear Pt−Tl−Fe complexes have been synthesized and structurally characterized. The final structures strongly depend on the geometry of the precursor and the Pt/Tl ratio used. Thus, the anionic heteroleptic cis-configured [cis-Pt(C6F5)2(C≡CFc)2]2− and [Pt(bzq)(C≡CFc)2]− (Fc = ferrocenyl) complexes react with Tl+ to form discrete octanuclear (PPh3Me)2[{trans,cis,cis-PtTl(C6F5)2(C≡CFc)2}2] (1), [PtTl(bzq)(C≡CFc)2]2 (5; bzq = benzoquinolate), and decanuclear [trans,cis,cis-PtTl2(C6F5)2(C≡CFc)2]2 (3) derivatives, stabilized by both PtII···TlI and TlI···η2(alkynyl) bonds. By contrast, Q2[trans-Pt(C6F5)2(C≡CFc)2] (Q = NBu4) reacts with Tl+ to give the one-dimensional (1-D) anionic [(NBu4){trans,trans,trans-PtTl(C6F5)2(C≡CFc)2}]n (2) and neutral [trans,trans,trans-PtTl2(C6F5)2(C≡CFc)2]n (4) polymeric chains based on [PtFc2]2− platinate fragments and Tl+ (2) or [Tl···Tl]2+ (4) units, respectively, connected by PtII···TlI and secondary weak κ-η1 (2) or η2 (4) alkynyl···TlI bonding. The forma...
24 citations