Das Geheimnis des Lapis lazuli

Encapsulation of red sulfur chromophores in a zeolitic imidazolate framework (ZIF-8) via solvent assisted linker exchange

“…Among the sulfur species present in ultramarines, the radicals S 3 À and S 2 À are most common which correspond to blue and yellow colors respectively [4,12,15] Depending on the proportion of each radical, a green color can also be formed [12,13,16,17]. A red shade seen in some ultramarines is due to the presence of the neutral S 4 molecule [6,16,18].…”

“…It is an aluminosilicate having the sodalite (SOD) structure with encapsulated S 3 À and S 2 À in the b cages that give rise to the famous ultramarine blue color [3,4]. The cages keep these unstable species from coming into contact with air or with each other [1].…”

TeS2.−-Radikalanionen in CuBrCu1.2TeS2

“…2 [18] und NF . 2 , [19] das Ozonid O .À 3 [20] und das tiefblaue S .À 3 [21] (Bestandteil des Lapislazuli [22] ). Zusammenfassende ESR-Untersuchungen über diese Radikalklasse, einschlieûlich Korrelationsbetrachtungen und der Abschätzung von d-Orbitalbeteiligungen, sind bereits erschienen.…”

TeS2.− Radical Anions in CuBrCu1.2TeS2

“…Top illumination of the crystals indicates their tendency for twinning by a characteristic reflection pattern. [22] The hydrogen atoms were placed in ideal positions and refined with a riding model that allows the rotation of the methyl groups about their local axes; max./min. The thickness of the single sheets is significantly smaller than 1 mm.…”

“…[20] by a 2q/w-scan in the range 7.0 2q 50.18. [22] The structure was refined as a racemic twin. residual electron density after the final difference Fourier synthesis 413/ À 330 e nm À3 , R1 0.046 (I b 2s(I)) and wR2 0.117 (all data).…”