NIR dyes based on [M(R,R ` timdt)(2)] metal-dithiolenes: Additivity of M, R, and R ` contributions to tune the NIR absorption (M = Ni, Pd, Pt; R,R ` timdt = monoreduced form of disubstituted imidazolidine-2,4,5-trithione)

TitleNIR dyes based on [M(R,R ` timdt)(2)] metal-dithiolenes: Additivity of M, R, and R ` contributions to tune the NIR absorption (M = Ni, Pd, Pt; R,R ` timdt = monoreduced form of disubstituted imidazolidine-2,4,5-trithione)
Publication TypeJournal Article
Year of Publication2003
Aragoni, MC, Arca, M, Cassano, T, Denotti, C, Devillanova, FA, Frau, R, Isaia, F, Lelj, F, Lippolis, V, Nitti, L, Romaniello, P, Tommasi, R, Verani, G
JournalEUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Issue10
Pagination1939-1947
Date PublishedMAY
Keywordspaper
Abstract

{With the aim of preparing new dyes for Q-switching and/or mode-locking Nd-based lasers, such as Nd:YLF and Nd:YAG (emission wavelengths 1053 and 1064 nm, respectively), the syntheses of about 30 new neutral dithiolenemetal complexes belonging to the class {[}M(R,R'timdt)(2)] have been carried out {[}M = Ni (4a-c; 4g-j), Pd (5a-j), Pt (6a-j); R,R'timdt = monoreduced form of disubstituted imidazolidine-2,4,5-trithione]. The examination of the effects induced on the intense NIR absorption by changing M, R, and R' has allowed for the recognition of the additive contributions (Deltalambda) of the central metal ion and of the substituents to the lambda(max)(M,R,R') max position of the NIR absorption maximum, which is in the region of 1000 nm. The high Deltalambda values due to aromatic substituents have been elucidated by means of Hybrid-DFT calculations performed on the model compound {[}Ni(H(2)timdt)(Ph,H-timdt)]. Both the k(max)(M,R,R') values and the molar extinction coefficients vary with the solvent. Complex 5f {[}M = Pd

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