ORCID Profile
0000-0002-6817-0810
Current Organisation
Max-Planck-Institut für Festkörperforschung
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Publisher: Wiley
Date: 09-07-2021
Abstract: At its core, reticular chemistry has translated the precision and expertise of organic and inorganic synthesis to the solid state. While initial excitement over metal–organic frameworks (MOFs) and covalent organic frameworks (COFs) was undoubtedly fueled by their unprecedented porosity and surface areas, the most profound scientific innovation of the field has been the elaboration of design strategies for the synthesis of extended crystalline solids through strong directional bonds. In this contribution we highlight the different classes of reticular materials that have been developed, how these frameworks can be functionalized, and how complexity can be introduced into their backbones. Finally, we show how the structural control over these materials is being extended from the molecular scale to their crystal morphology and shape on the nanoscale, all the way to their shaping on the bulk scale.
Publisher: Elsevier BV
Date: 03-2021
Publisher: Wiley
Date: 09-07-2021
Abstract: Im Wesentlichen hat die retikuläre Chemie die Präzision und Expertise der organischen und anorganischen Synthese auf den festen Zustand übertragen. Während die anfängliche Aufregung über Metall‐organische Gerüstverbindungen (MOFs) und kovalente organische Gerüstverbindungen (COFs) zweifellos durch ihre beispiellose Porosität und Oberfläche befeuert wurde, war die tiefgreifendste wissenschaftliche Innovation des Feldes die Ausarbeitung von Designstrategien für die Synthese von erweiterten kristallinen Festkörpern durch starke gerichtete Bindungen. In diesem Aufsatz beleuchten wir die verschiedenen Klassen von retikulären Materialien, die entwickelt worden sind, wie solche Gerüstverbindungen funktionalisiert werden können und wie Komplexität in ihr Grundgerüst eingeführt werden kann. Schließlich zeigen wir, wie die strukturelle Kontrolle über diese Materialien von der molekularen Skala über ihre Kristallmorphologie und Form auf der Nanoskala bis hin zu ihrer Gestaltung auf der Bulk‐Skala erweitert wird.
Publisher: International Union of Crystallography (IUCr)
Date: 16-01-2022
DOI: 10.1107/S2052520621013032
Abstract: Synthetic and naturally occurring forms of tricopper orthotellurate, Cu II 3 Te VI O 6 (the mineral mcalpineite) have been investigated by 3D electron diffraction (3D ED), X-ray powder diffraction (XRPD), Raman and infrared (IR) spectroscopic measurements. As a result of the diffraction analyses, Cu II 3 Te VI O 6 is shown to occur in two polytypes. The higher-symmetric Cu II 3 Te VI O 6 -1 C polytype is cubic, space group Ia 3 , with a = 9.537 (1) Å and V = 867.4 (3) Å 3 as reported in previous studies. The 1 C polytype is a well characterized structure consisting of alternating layers of Cu II O 6 octahedra and both Cu II O 6 and Te VI O 6 octahedra in a patchwork arrangement. The structure of the lower-symmetric orthorhombic Cu II 3 Te VI O 6 -2 O polytype was determined for the first time in this study by 3D ED and verified by Rietveld refinement. The 2 O polytype crystallizes in space group Pcca , with a = 9.745 (3) Å, b = 9.749 (2) Å, c = 9.771 (2) Å and V = 928.3 (4) Å 3 . High-precision XRPD data were also collected on Cu II 3 Te VI O 6 -2 O to verify the lower-symmetric structure by performing a Rietveld refinement. The resultant structure is identical to that determined by 3D ED, with unit-cell parameters a = 9.56157 (19) Å, b = 9.55853 (11) Å, c = 9.62891 (15) Å and V = 880.03 (2) Å 3 . The lower symmetry of the 2 O polytype is a consequence of a different cation ordering arrangement, which involves the movement of every second Cu II O 6 and Te VI O 6 octahedral layer by (1/4, 1/4, 0), leading to an offset of Te VI O 6 and Cu II O 6 octahedra in every second layer giving an ABAB * stacking arrangement. Syntheses of Cu II 3 Te VI O 6 showed that low-temperature (473 K) hydrothermal conditions generally produce the 2 O polytype. XRPD measurements in combination with Raman spectroscopic analysis showed that most natural mcalpineite is the orthorhombic 2 O polytype. Both XRPD and Raman spectroscopy measurements may be used to differentiate between the two polytypes of Cu II 3 Te VI O 6 . In Raman spectroscopy, Cu II 3 Te VI O 6 -1 C has a single strong band around 730 cm −1 , whereas Cu II 3 Te VI O 6 -2 O shows a broad double maximum with bands centred around 692 and 742 cm −1 .
No related grants have been discovered for Stefano Canossa.