Interplay of thermochemistry and Structural Chemistry, the journal (Volume 26, 2015, Issues 1–2) and the discipline

Structural Chemistry - The contents of issues 1 and 2 of Structural Chemistry from the calendar year 2015 are summarized in the present review. A brief thermochemical commentary and possible...     

Structural Chemistry of Cu(I) Allyl and Acetylene π-Complexes

Stereospecific behavior of allyl derivatives and acetylenes in CuX -complexes (X = Cl^-, Br^-, NO₃ ^-, BF₄ ^-, 1/2SiF₆ ^2-, 1/2SO₄ ^2-) is studied by X-ray diffraction analysis. The influence of donor atoms N, S, and O and of the Cu-X bond polarization on the -complex formation is considered. The efficiency of Cu-(C=C) and Cu-(CC) -interaction and specific behavior of mono- and disubstituted acetylenes with respect to Cu(I) are compared.     

How Does the Fluorination of the Linker Affect the Structural Chemistry of Trimesate-Based Metal-Organic Frameworks (MOFs)?

FMOFs, i.e. metal-organic frameworks with linkers with fluoro substituents, were supposed to show enhanced thermal and chemical stability as well as high gas affinity and hydrophobicity. However, at least for aromatic carboxylate ligands it was shown in a subsequent work that fluoro substituents weaken the C(phenyl)-COO^– bond and thus facilitate decarboxylation leading to a decreased chemical and thermal stability. Nonetheless, it was concluded that linker fluorination leads to a rich structural chemistry, as the torsion angle between the phenyl ring and the carboxylate group is significantly increased in these compounds. Here, we present the very first examples of four MOFs all based on Sr²⁺ cations and trimesate-based linkers with three different degrees of fluorination as well as the known non-fluorinated counterpart: [Sr(HL)(H₂O)] · n H₂O [ 1 : L = mF-BTC^3–, n = 0.5, P1 , Z = 2; 2 : L = dF-BTC^3–, n = 0.5, C2/c, Z = 8; 3 : L = pF-BTC^3–, n = 1.5, C2/c, Z = 8; 4 : L = BTC^3–, n = 0.5, P1 , Z = 2; BTC^3– ≡ 1,3,5-benzenetricarboxylate (trimesate); mF-BTC^3– ≡ monofluorinated trimesate, dF-BTC^3– ≡ difluorinated trimesate, pF-BTC^3– ≡ per-(tri-)fluorinated trimesate]. Whereas 1 and known 4 are found to crystallize in isotypic structures and 2 in a very similar structural arrangement [all CN(Sr²⁺) = 9], 3 with the highest degree of fluorination exhibits a completely different crystal structure [CN(Sr²⁺) = 8], which is already obvious from the different composition. It is shown that the torsion angles between the phenyl ring and the carboxylate groups play an important structure-directing role. DSC/TGA investigations confirm that with increasing fluorination the thermal stability is decreased. However, the release temperature of water, i.e. the affinity to water, increases with the number of fluoro substituents.     

Interplay of thermochemistry and Structural Chemistry: the journal (volume 29, 2018, issues 5–6) and the discipline

The contents of issues 5 and 6 of Structural Chemistry from the calendar year 2018 are summarized in the present review. A brief thermochemical commentary and recommendations for future research have been added to the summary of each paper.

     

Interplay of thermochemistry and Structural Chemistry,the journal (volume 28, 2017, issues 3–4) and the discipline

Structural Chemistry - The contents of issues 3 and 4 of Structural Chemistry from the calendar year 2017 are summarized in the present review. A brief thermochemical commentary and recommendations...     

Interplay of thermochemistry and Structural Chemistry,the journal (volume 29, 2018, issues 3–4) and the discipline

The contents of issues 3 and 4 of Structural Chemistry from the calendar year 2018 are summarized in the present review. A brief thermochemical commentary and recommendations for future research have been added to the summary of each paper.

     

Interplay of thermochemistry and Structural Chemistry,the Journal (volume 22, 2011, issues 1–3) and the discipline

In the current review of the journal Structural Chemistry, the content of the first three issues for the calendar year 2011 is related to thermochemistry. Each paper is summarized and followed by a short thermochemical comment.     

Interplay of thermochemistry and Structural Chemistry, the journal (volume 23, 2012, issues 1–3) and the discipline

In the current review of the journal Structural Chemistry, the contents of the issues 1–3 for the calendar year 2012 are related to thermochemistry. A brief thermochemical commentary is added to the summary of each article.     

Interplay of thermochemistry and Structural Chemistry, the journal (volume 23, 2012, issues 4–6) and the discipline

In the current review of the journal Structural Chemistry, the contents of the issues 4–6 for the calendar year 2012 are related to thermochemistry. A brief thermochemical commentary is added to the summary of each paper.     

Interplay of thermochemistry and Structural Chemistry: the journal (volume 29, 2018, issues 1–2) and the discipline

Structural Chemistry - The contents of issues 1 and 2 of Structural Chemistry from the calendar year 2018 are summarized in the present review. A brief thermochemical commentary and recommendations...     

Editorial Board page for “Journal of Macromolecular Science—Chemistry”, Volume A29, Number 3

This is a scanned image of the original Editorial Board page(s) for this issue.     

Editorial Board page for “Journal of Macromolecular Science—Chemistry”, Volume A28, Number 7

This is a scanned image of the original Editorial Board page(s) for this issue.     

Chemistry of1,16–Dihydroxytetraphenylene and 2,3,9,10–Tetrakis(trimethylsilyl)pentacene

Recently, four tetraphenylenols, as well as several non–substituted and substituted 2,3,9,10–tetrakis(trimethylsilyl)pentacenes were realized in our laboratories. In this presentation, the synthesis, hydrogen bonding properties, and chiral recognition studies of (S)–1,16–dihydroxytetraphenylene (1) and its (R)–enantiomer will be delineated. 1,16–Bis(diphenylphosphino)tetraphenylene (2) was also realized from 1 and was employed in the formation of a stable platinum complex. The synthesis…     

Sixty-Year Saga (1952–2013) of the Solid-State Structure of Triiron Dodecacarbonyl

This article presents the personal saga of one of the authors (LFD) in the determination of the solid-state structure of Fe₃(CO)₁₂. We also present the results of our recent determination of its solid-state structure at low temperature (100 K), in which we have used a modern area-detector diffractometer in order to examine more precisely its temperature-dependent structural variations reported by Braga et al. in 1994 from a point-detector diffractometer. These investigations provide a striking illustration of the remarkable advances over the last six decades in both computational hardware and software packages as well as the recent improvements in hardware data-collection instrumentation that have given rise to X-ray crystallography now being the most powerful (and in most cases the only unambiguous) physical method for elucidating the static structures of complex metal clusters. Other experimental measurements and resulting speculations concerning the dynamic/fluxional behavior of Fe₃(CO)₁₂ and closely related analogues in the solid state and in solution are briefly mentioned, as are recent theoretical analyses.     

Structural studies of the aeschynite–euxenite transformation in the series Ln(TiTa)O6 Ln = Lanthanide

Ceramics based on LnTiTaO₆ (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) were prepared using a conventional solid-state ceramic route. The structure and microstructure of the samples were analyzed using scanning electron microscopy, synchrotron X-ray powder diffraction and neutron diffraction techniques. The unit cell volume of the ceramics decreased with a decrease in ionic radius of the rare-earth ions until a phase change was seen at Ho where the space group changed from Pnma to Pbcn. The results confirmed that the boundary of the aeschynite to euxenite phase change that lies between DyTiTaO₆ and HoTiTaO₆ and demonstrate that this is a result of distortion of the channels in the aeschynite structure.     

Editorial Board page for “Journal of Macromolecular Science—Chemistry”, Volume A28, Number 3-4

This is a scanned image of the original Editorial Board page(s) for this issue.