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.

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 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

scholarly journals A new class of pyrenyl solid-state emitters: 1-pyrenyl ynones. Synthesis via the Friedel–Crafts route, molecular and electronic structure and photophysical properties

RSC Advances ◽  
2014 ◽  
Vol 4 (60) ◽  
pp. 31594-31601 ◽  
Author(s):  
Rafał Flamholc ◽  
Damian Plażuk ◽  
Janusz Zakrzewski ◽  
Rémi Métivier ◽  
Keitaro Nakatani ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Solid State ◽  
Photophysical Properties ◽  
Trifluoroacetic Anhydride ◽  
Triflic Acid ◽  
New Class ◽  
Efficient Route ◽  
Molecular And Electronic Structure

Friedel-Crafts acylation of pyrene with alkynoic acids in the presence of trifluoroacetic anhydride and triflic acid constitutes a direct and efficient route to 1-pyrenyl ynones fluorescent in solution and in the solid state.

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

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.

scholarly journals Synthesis, Structural and Physicochemical Characterization of a Titanium(IV) Compound with the Hydroxamate Ligand N,2-Dihydroxybenzamide

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5588
Author(s):  
Stamatis S. Passadis ◽  
Sofia Hadjithoma ◽  
Panagiota Siafarika ◽  
Angelos G. Kalampounias ◽  
Anastasios D. Keramidas ◽  
...  
Keyword(s):  
Solid State ◽  
Methyl Alcohol ◽  
Density Functional ◽  
Organic Ligand ◽  
High Energy ◽  
Structural Motif ◽  
Molecular Orbital Calculations ◽  
Ortho Position ◽  
Esi Ms ◽  
Acid Base Equilibrium

The siderophore organic ligand N,2-dihydroxybenzamide (H2dihybe) incorporates the hydroxamate group, in addition to the phenoxy group in the ortho-position and reveals a very rich coordination chemistry with potential applications in medicine, materials, and physical sciences. The reaction of H2dihybe with TiCl4 in methyl alcohol and KOH yielded the tetranuclear titanium oxo-cluster (TOC) [TiIV4(μ-O)2(HOCH3)4(μ-Hdihybe)4(Hdihybe)4]Cl4∙10H2O∙12CH3OH (1). The titanium compound was characterized by single-crystal X-ray structure analysis, ESI-MS, 13C, and 1H NMR spectroscopy, solid-state and solution UV–Vis, IR vibrational, and luminescence spectroscopies and molecular orbital calculations. The inorganic core Ti4(μ-O)2 of 1 constitutes a rare structural motif for discrete TiIV4 oxo-clusters. High-resolution ESI-MS studies of 1 in methyl alcohol revealed the presence of isotopic distribution patterns which can be attributed to the tetranuclear clusters containing the inorganic core {Ti4(μ-O)2}. Solid-state IR spectroscopy of 1 showed the presence of an intense band at ~800 cm−1 which is absent in the spectrum of the H2dihybe and was attributed to the high-energy ν(Ti2–μ-O) stretching mode. The ν(C=O) in 1 is red-shifted by ~10 cm−1, while the ν(N-O) is blue-shifted by ~20 cm−1 in comparison to H2dihybe. Density Functional Theory (DFT) calculations reveal that in the experimental and theoretically predicted IR absorbance spectra of the ligand and Ti-complex, the main bands observed in the experimental spectra are also present in the calculated spectra supporting the proposed structural model. 1H and 13C NMR solution (CD3OD) studies of 1 reveal that it retains its integrity in CD3OD. The observed NMR changes upon addition of base to a CD3OD solution of 1, are due to an acid–base equilibrium and not a change in the TiIV coordination environment while the decrease in the complex’s lability is due to the improved electron-donating properties which arise from the ligand deprotonation. Luminescence spectroscopic studies of 1 in solution reveal a dual narrow luminescence at different excitation wavelengths. The TOC 1 exhibits a band-gap of 1.98 eV which renders it a promising candidate for photocatalytic investigations.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

The Collagenic Molecular Structural Unit of Solid State Complexes

1971 ◽  
Vol 29 ◽  
pp. 478-479
Author(s):  
Kenneth M. Richter ◽  
John A. Schilling
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Structural Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naoh Treatment

The structural unit of solid state collagen complexes has been reported by Porter and Vanamee via EM and by Cowan, North and Randall via x-ray diffraction to be an ellipsoidal unit of 210-270 A. length by 50-100 A. diameter. It subsequently was independently demonstrated by us in dog tendon, dermis, and induced complexes. Its detailed morphologic, dimensional and molecular weight (MW) aspects have now been determined. It is pear-shaped in long profile with m diameters of 57 and 108 A. and m length of 263 A. (Fig. 1, tendon, KMnO4 fixation, Na-tungstate; Fig. 2a, schematic of unit in long, C, and x-sectional profiles of its thin, xB, and bulbous, xA portions; Fig. 2b, tendon essentially unmodified by ether and 0.4 N NaOH treatment, Na-tungstate). The unit consists of a uniquely coild cable, c, of ṁ 22.9 A. diameter and length of 2580-3316 A. The cable consists of three 2nd-strands, s, each of m 10.6 A.

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