LiEC(SiMe3)3(E = Se, Te) as a new donor of chalcogen atoms for the generation of binary [(RxGey)Ez] cage compounds with unique structural features

Kunz, Tanja; Şahin, Orhan; Schrenk, Claudio; Schnepf, Andreas

doi:10.1039/d0dt04280c

Cited by 2 publications

(1 citation statement)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference between the corresponding interatomic distances—and thus the irregularity of the cluster cores, get more significant with increasing atomic size of the respective chalcogen atom E (a detailed discussion of the structural features of 1 , 2 , and 3 can be found in Note S1, Supporting Information). [ 29,36–40 ] This molecular inhomogeneity is the bases for the materials behavior, as reported and discussed in Sections 3–6. Note that related compounds of the type [(R 1 T 1 )(CH 2 ) 3 (R 2 T 2 )E 3 ] were recently reported for R 1 = Me, and E = O), which we modified here to be electron‐rich substituents Ph for R 1 and R 2 besides more electron‐rich chalcogen ligands E = S, Se, and Te.…”

Section: Synthesis and Crystal Structures Of Adamantane‐type Clusters...mentioning

confidence: 86%

Cluster‐Glass for Low‐Cost White‐Light Emission

et al. 2022

View full text Add to dashboard Cite

The term "supercontinuum generation" describes an extreme spectral broadening of an originally monochromatic light beam upon propagating through a nonlinear medium, [8,10] as an alternative to the conventional generation of white light by means of inorganic phosphors or inorganic as well as organic semiconductors. [14][15][16] The broad spectrum obtained may cover the entire visible spectral range; in these cases, the observed emission resembles white light and the process is therefore referred to as WLG. The physical mechanisms underlying supercontinuum generation can be diverseand can also occur as a combination of nonlinear optical effects, like self-phase and cross-phase modulation, four-wave mixing, or solitonic phenomena. [17][18][19][20] While in most cases pulsed-laser sources are required for such processes, WLG upon irradiation of a material with a near-infrared continuous-wave (NIR CW) laser of significantly lower costs (by a factor of ≈10 3 …10 4 as compared to the pulsed lasers) has been reported for (doped) oxides or oxidic hybrid compounds, for complexes of rare-earth metals, and for carbon-based solids. [1] Given the complexity of the processes, different compounds exhibiting WLG can show the extreme nonlinear effects owing to different reasons or different combinations of mechanisms, which in many cases have not yet been fully elucidated to date.The development of efficient and high-brilliance white-light sources is an essential contribution to innovative emission technologies. Materials exhibiting strong nonlinear optical properties, in particular second-harmonic generation (SHG) or white-light generation (WLG), have therefore been investigated with great activity in recent times. While many new approaches have been reported until now, the processability of the compounds remains a challenge. Here, a new class of materials, denoted as "cluster-glass", which do not only show superior white-light emission properties upon irradiation by an inexpensive continuous-wave infrared laser diode, but can be easily accommodated in size and shape by formation of robust glassy solids, is introduced. The cluster-glass materials are fabricated by mild heating from crystalline powders of adamantane-type clusters exhibiting a quaternary, inorganic-organic hybrid cluster core [(PhSi)(CH 2 ) 3 (PhSn)E 3 ] (E = S, Se, Te). The process is fully reversible and preserves the integrity of the clusters in the glass, as proven by solution spectroscopy and recrystallization. Theoretical studies corroborate the importance of the quaternary nature of the cluster cores for the observed structural and optical phenomena. Thanks to these findings, high-brilliance white-light sources can be synthesized in form of stable, robust glass of any shape, which ultimately renders them suitable for everyday's applications.

show abstract

Section: Synthesis and Crystal Structures Of Adamantane‐type Clusters...mentioning

confidence: 86%