Guest induced head-to-tail columnar assembly of 5,17-difunctionalized calix[4]arene

CrystEngComm ◽  
2014 ◽  
Vol 16 (27) ◽  
pp. 6023-6032 ◽  
Author(s):  
Ryo Sekiya ◽  
Yutaro Yamasaki ◽  
Wataru Tada ◽  
Hidemi Shio ◽  
Takeharu Haino
Keyword(s):  
Solid State ◽  
Columnar Structure ◽  
Structural Motif ◽  
Organic Guests

Calix[4]arenes often form dimeric capsules or up-down bilayer arrangements in the solid state. The head-to-tail polymeric columnar structure found in the cocrystals composed of 5,17-difunctionalized calix[4]arene 1 and organic guests represents another structural motif for calix[4]arenes.

scholarly journals Oxygenation of RZn(N,O)-type complexes as an efficient route to zinc alkoxides not accessible via the classical alcoholysis path

2017 ◽  
Vol 53 (78) ◽  
pp. 10808-10811 ◽  
Author(s):  
Zbigniew Wróbel ◽  
Tomasz Pietrzak ◽  
Iwona Justyniak ◽  
Janusz Lewiński
Keyword(s):  
Solid State ◽  
Structural Motif ◽  
Efficient Route

The oxygenation of alkylzincs incorporating a 2-ester substituted pyrrolate ligand (L) leads to zinc alkoxides with an uncommon structural motif in the solid state: a trimer [(L)Zn(μ-OtBu)]3 with the central [Zn3(μ-OR)3] ring or a heterocubane [(L)Zn(μ3-OEt)]4.

scholarly journals Sc0.43(2)Rb2Mo15S19, a partially Sc-filled variant of Rb2Mo15S19

2012 ◽  
Vol 68 (5) ◽  
pp. i25-i28 ◽  
Author(s):  
Patrick Gougeon ◽  
Rabih Al Rahal Al Orabi ◽  
Régis Gautier ◽  
Michel Potel
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Unique Feature ◽  
Point Group ◽  
Tight Binding ◽  
Median Plane ◽  
Structural Motif ◽  
Space Group ◽  
Group Symmetries ◽  
Cluster Unit

The structure of scandium dirubidium pentadecamolybdenum nonadecasulfide, Sc0.43 (2)Rb2Mo15S19, constitutes a partially Sc-filled variant of Rb2Mo15S19[Picard, Saillard, Gougeon, Noel & Potel (2000),J. Solid State Chem.155, 417–426]. In the two compounds, which both crystallize in theR\overline{3}cspace group, the structural motif is characterized by a mixture of Mo6Si8Sa6and Mo9Si11Sa6cluster units (`i' is inner and `a' is apical) in a 1:1 ratio. The two components are interconnected through interunit Mo—S bonds. The cluster units are centred at Wyckoff positions 6band 6a(point-group symmetries \overline{3}. and 32, respectively). The Rb+cations occupy large voids between the different cluster units. The Rb and the two inner S atoms lie on sites with 3. symmetry (Wyckoff site 12c), and the Mo and S atoms of the median plane of the Mo9S11S6cluster unit lie on sites with .2 symmetry (Wyckoff site 18e). A unique feature of the structure is a partially filled octahedral Sc site with \overline{1} symmetry. Extended Hückel tight-binding calculations provide an understanding of the variation in the Mo—Mo distances within the Mo clusters induced by the increase in the cationic charge transfer due to the insertion of Sc.

Solid state and solution conformation of 2-pyridinecarboxylic acid hydrazides: a new structural motif for foldamers

2003 ◽  
Vol 44 (7) ◽  
pp. 1421-1424 ◽  
Author(s):  
Joachim Garric ◽  
Jean-Michel Léger ◽  
Axelle Grelard ◽  
Masakazu Ohkita ◽  
Ivan Huc
Keyword(s):  
Solid State ◽  
Structural Motif ◽  
Solution Conformation ◽  
Pyridinecarboxylic Acid

Calix[4]Arene Cavitands: A Solid State Study on the Interactions of their Aromatic Cavity with Neutral Organic Guests Characterised by Acid CH3 or CH2 Groups

2000 ◽  
Vol 12 (3) ◽  
pp. 273-291 ◽  
Author(s):  
Arturo Arduini ◽  
Francine F. Nachtigall ◽  
Andrea Pochini ◽  
Andrea Secchi ◽  
Franco Ugozzoli
Keyword(s):  
Solid State ◽  
State Study ◽  
Organic Guests

scholarly journals Investigation on the Precipitates of IN718 Alloy Fabricated by Selective Laser Melting

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1128 ◽  
Author(s):  
Yu Cao ◽  
Pucun Bai ◽  
Fei Liu ◽  
Xiaohu Hou
Keyword(s):  
Solid State ◽  
Selective Laser Melting ◽  
Shell Structure ◽  
Solidification Rate ◽  
Columnar Structure ◽  
State Transformation ◽  
Laser Melting ◽  
Solid State Transformation ◽  
Inconel 718 Alloy ◽  
The Matrix

The microstructure and precipitates of INCONEL 718 alloy (IN718) fabricated by selective laser melting (SLM) are investigated. The matrix is comprised of the elongated γ grains along Z direction, tilting a few degrees. The microstructure mainly consists of a cellular–columnar structure with fine first dendrite arm space of 1–1.5 µm originated from the rapid solidification rate locally. The precipitates of the SLMed IN718 are confirmed to be a significant amount of Laves in the form of irregular bulk distribution, small amount of carbonitride and spherical Al2O3 particles in nanoscale. Some of the carbonitrides grow separately and some of the carbonitrides enwrap the Al2O3 fully or partly, forming the shell structure of the Al2O3–carbonitride. The reheating effect from the following layers to the previous layers have not reached the solid-state transformation temperature of the γ′ and γ″.

Head-to-tail polymeric columnar structure of calix[4]arene possessing catechol arms in the solid state

CrystEngComm ◽  
2013 ◽  
Vol 15 (42) ◽  
pp. 8404 ◽  
Author(s):  
Ryo Sekiya ◽  
Yutaro Yamasaki ◽  
Susumu Katayama ◽  
Hidemi Shio ◽  
Takeharu Haino
Keyword(s):  
Solid State ◽  
Columnar Structure

A Traditional Synthetic Method, and a New Structural Motif, for Molybdenum−Gold Clusters:  Synthesis and Solid-State Structure of Au8{Mo(CO)5}4(PPh3)4

2006 ◽  
Vol 45 (21) ◽  
pp. 8465-8467 ◽  
Author(s):  
Roberto Della Pergola ◽  
Luigi Garlaschelli ◽  
Maria Carlotta Malatesta ◽  
Carlo Manassero ◽  
Mario Manassero
Keyword(s):  
Solid State ◽  
Gold Clusters ◽  
Structural Motif ◽  
Synthetic Method ◽  
State Structure ◽  
Solid State Structure

scholarly journals Hyper-reticulated calixarene polymers: a new example of entirely synthetic nanosponge materials

2018 ◽  
Vol 14 ◽  
pp. 1498-1507 ◽  
Author(s):  
Alberto Spinella ◽  
Marco Russo ◽  
Antonella Di Vincenzo ◽  
Delia Chillura Martino ◽  
Paolo Lo Meo
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Hydrophobic Interactions ◽  
Morphological Characterization ◽  
New Class ◽  
Polymeric Network ◽  
Electrostatic And Hydrophobic Interactions ◽  
Nmr Techniques ◽  
Organic Guests ◽  
Ph Dependent

New calixarene-based nanosponges (CaNSs), i.e., hyper-reticulated polymers constituted by calixarene monomer units joined by means of bis(1,2,3-trialzolyl)alkyl linkers, were synthesized, characterized and subjected to preliminary tests to assess their supramolecular absorption abilities towards a set of suitable organic guests, selected as pollutant models. The synthesis was accomplished by means of a CuAAC reaction between a tetrakis(propargyloxy)calix[4]arene and an alkyl diazide. The formation of the polymeric network was assessed by means of FTIR and 13C{1H} CP-MAS solid-state NMR techniques, whereas morphological characterization was provided by SEM microghaphy. The materials were proved to possess pH-dependent sequestration abilities, due to the presence of the weakly basic triazole linkers. Sequestration efficiency indeed depends on the effective occurrence of both electrostatic and hydrophobic interactions between the guest and the polymer lattice. Thus, our CaNS nanosponges can be considered as a new class of purely synthetic smart absorbent materials.

The Structure of 4,7-Bis((trimethylsilyl)ethynyl)benzo[c][1,2,5]thiadiazole and Identification of a Widespread S···N Structural Motif

2008 ◽  
Vol 61 (10) ◽  
pp. 755 ◽  
Author(s):  
Amar Boudebous ◽  
Edwin C. Constable ◽  
Catherine E. Housecroft ◽  
Markus Neuburger ◽  
Silvia Schaffner
Keyword(s):  
Solid State ◽  
Structural Motif ◽  
State Structure ◽  
Solid State Structure ◽  
Dimeric Structure

The solid-state structure of 4,7-bis((trimethylsilyl)ethynyl)benzo[c][1,2,5]thiadiazole reveals a dimeric structure with short S···N contacts, a motif that is shown to be common in electron-poor macrocycles of this type and that is likely to be a significant factor in the design of devices using materials based on these compounds.

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