◾ Triclinic Crystal System: DL-Leucine

2014 ◽  
pp. 456-477
Keyword(s):  
Triclinic Crystal System ◽  
Crystal System

scholarly journals Characterization of Chitosan-Bentonite and Water Hyacinth Plant as a Potential Adsorbent

2018 ◽  
Vol 1 (1) ◽  
pp. 50
Author(s):  
Moondra Zubir ◽  
Hafni Indriati Nasution ◽  
Mutya Fika Safitri ◽  
Agustina Mandasari
Keyword(s):  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Xrd Analysis ◽  
Silica Content ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Crystal System ◽  
Infra Red ◽  
Ftir Spectrophotometry

Water hyacinth (Eichhornia crassipes) has a very rapid growth in the waters so it can cause eutrophication. The silica content of 5.56% allows water hyacinth can be utilized as a natural adsorbent. Bentonit has an advantage as an adsorbent because it has an inter-layered structure that can be easily modified with chitosan, resulting in better performance as an eco-friendly adsorbent. This research aims to determine the characterization of chitosan-bentonite and water hyacinth as a adsorbent of Pb(II)removal. Characterization tests were performed using X-ray difraction (XRD) and Fourier Transform Infra Red (FTIR) spectrophotometry. From the results of quantitative XRD analysis can be seen that the adsorbent of chitosan-bentonit and water hyacinth have different adsorbent characteristic, but has the same crystal system that is triclinic crystal system.

scholarly journals Crystal structures and Hirshfeld surface analyses of bis(4,5-dihydrofuran-2-yl)dimethylsilane and (4,5-dihydrofuran-2-yl)(methyl)diphenylsilane

2022 ◽  
Vol 78 (1) ◽  
Author(s):  
Annika Schmidt ◽  
Anna Krupp ◽  
Eva Rebecca Barth ◽  
Carsten Strohmann
Keyword(s):  
Crystal Structures ◽  
Building Blocks ◽  
Hirshfeld Surface ◽  
Polymeric Chain ◽  
Triclinic Crystal System ◽  
Space Group ◽  
Axis Direction ◽  
Crystal System ◽  
Hirshfeld Surfaces ◽  
Interconnected Structure

The title compounds, C10H16O2Si (1) and C17H18OSi (2), are classified as dihydrofurylsilanes, which show great potential as building blocks for various functionalized silanes. They both crystallize in the space group P\overline{1} in the triclinic crystal system. Analyses of the Hirshfeld surfaces show packing-determining interactions for both compounds, resulting in a polymeric chain along the [011] for silane 1 and a layered-interconnected structure along the b-axis direction for silane 2.

scholarly journals The Crystal Structure of Zineb, 75 years later

2019 ◽  
Author(s):  
Jonathan B Lefton ◽  
Kyle B Pekar ◽  
Tomce Runcevski
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
20Th Century ◽  
Thermal Characteristics ◽  
Structural Features ◽  
Inversion Symmetry ◽  
Triclinic Crystal System ◽  
Space Group ◽  
Crystal System ◽  
Short Summary

Ethylene bis(dithiocarbamates) (EBDTCs) have been used as staple fungicides for over 75 years. The first industrially manufactured EBDTC was zineb, zinc ethylene bis(dithiocarbamate), marketed under the tradename Dithane. Even though zineb has been used as a fungicide since the 1940s, its crystal structure remained unknown. Herein, we describe the crystal structure of zineb (triclinic crystal system, space group P–1, a = 7.5094(9) Å, b = 9.4356(9) Å, c = 7.4120(7) Å, α = 107.945(8) °, β = 100.989(7) °, γ = 105.365(8) °, V = 460.07(10) Å3). The inorganic fragment of the structure consists of two Zn2+ cations, coordinated by the thiocarbamate group. There are four Zn–S bonds with lengths in the range of 2.325 – 2.426 Å, and one rather long Zn–S contact of 2.925(8) Å. Inorganic fragments are linked by organic EBDTC ligands to form extended, polymeric layers. The layers are packed in a ABAB manner, related by the inversion symmetry and held together by hydrogen bonding network. In this article, in addition to describing the crystal structure, we correlate the structural features with the vibrational spectroscopic and thermal characteristics of zineb, and we provide a short summary of the major developments of fungicides in the 20th century<br>

scholarly journals The Effects of Al2O3 and SiO2 on the Formation Process of Silico-Ferrite of Calcium and Aluminum (SFCA) by Solid-State Reactions

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 101
Author(s):  
Fei Liao ◽  
Xing-Min Guo
Keyword(s):  
Solid State Reactions ◽  
Orthorhombic Crystal ◽  
Initial Product ◽  
Triclinic Crystal System ◽  
Crystal System ◽  
Effect Mechanism ◽  
Iron Aluminum ◽  
High Basicity ◽  
Different Temperatures ◽  
Calcium Iron

The silico-ferrite of calcium and aluminum (SFCA) is a significant crystalline phase that bonds in high basicity sinter. Al2O3 and SiO2 play an important role in the formation of SFCA in the Fe2O3–CaO–SiO2–Al2O3 system, but the effect mechanism of Al2O3 and SiO2 on the formation of SFCA is unclear. To investigate this effect, sintering experiments were carried out with different temperatures and different times. It was found that the reaction of Al2O3 with CaFe2O4 (CF) as an initial product was easier to form during the calcium iron aluminum oxide (CFA) than that of SiO2 with CF to form SFC. This was due to the former directly forming to CFA while the latter initially formed Ca2SiO4 (C2S) and Ca2.5Fe15.5O25, and then SFC. It was also observed that when Al2O3 and SiO2 existed simultaneously, the Al2O3 initially reacted with CF to form CFA at 1100 °C, while the SiO2 participated in the formation of SFCA at 1150 °C without the formation of SFC. Moreover, it was understood that these were different effects in that the Al2O3 promoted the transformation from the orthorhombic crystal system to the triclinic crystal system, while the SiO2 dissolved into CFA to form the SFCA phase when Al2O3 existed.

Synthesis and Structural Characterization of N,N´- Dipropyl-N,N,N´,N´-tetramethyl-1,2- ethylenediammonium Dichloride and Dibromide

2011 ◽  
Vol 66 (7) ◽  
pp. 755-758
Author(s):  
Sari M. Närhi ◽  
Janne Asikkala ◽  
Jatta Kostamo ◽  
Marja K. Lajunen ◽  
Raija Oilunkaniemi ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Water Molecules ◽  
Monoclinic Crystal System ◽  
X Ray Diffraction ◽  
Monoclinic Crystal ◽  
Triclinic Crystal System ◽  
Space Group ◽  
X Ray ◽  
Crystal System

N,N´-Dipropyl-N,N,N´ ,N´-tetramethyl-1,2-ethylenediammonium dichloride (1) and dibromide (2) were prepared by the reaction of N,N,N´,N´-tetramethyl-1,2-ethylenediamine and the corresponding 1-halopropane. The structures of the compounds were characterized by single-crystal X-ray diffraction. 1 · 2H2O crystallizes in the triclinic crystal system, space group P1, with Z = 1, and 2 in the monoclinic crystal system, space group P21/c, with Z = 2. The crystal structures of the salts consist of discrete dications and halide anions. The packing in 1 · 2H2O consists of layers of cations with the chloride anions and water molecules forming hydrogen-bonded chains between the cation layers. In 2, the strongest H· · ·Br hydrogen bonds of 2.8138(6) and 2.8187(7) °A link the cations and anions into doublestranded chains. In both salts, cations and anions are also linked together by a further weak C-H· · ·Cl/Br hydrogen bonding network.

scholarly journals The Crystal Structure of Zineb, 75 years later

2019 ◽  
Author(s):  
Jonathan B Lefton ◽  
Kyle B Pekar ◽  
Tomce Runcevski
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
20Th Century ◽  
Thermal Characteristics ◽  
Structural Features ◽  
Inversion Symmetry ◽  
Triclinic Crystal System ◽  
Space Group ◽  
Crystal System ◽  
Short Summary

Ethylene bis(dithiocarbamates) (EBDTCs) have been used as staple fungicides for over 75 years. The first industrially manufactured EBDTC was zineb, zinc ethylene bis(dithiocarbamate), marketed under the tradename Dithane. Even though zineb has been used as a fungicide since the 1940s, its crystal structure remained unknown. Herein, we describe the crystal structure of zineb (triclinic crystal system, space group P–1, a = 7.5094(9) Å, b = 9.4356(9) Å, c = 7.4120(7) Å, α = 107.945(8) °, β = 100.989(7) °, γ = 105.365(8) °, V = 460.07(10) Å3). The inorganic fragment of the structure consists of two Zn2+ cations, coordinated by the thiocarbamate group. There are four Zn–S bonds with lengths in the range of 2.325 – 2.426 Å, and one rather long Zn–S contact of 2.925(8) Å. Inorganic fragments are linked by organic EBDTC ligands to form extended, polymeric layers. The layers are packed in a ABAB manner, related by the inversion symmetry and held together by hydrogen bonding network. In this article, in addition to describing the crystal structure, we correlate the structural features with the vibrational spectroscopic and thermal characteristics of zineb, and we provide a short summary of the major developments of fungicides in the 20th century<br>

Unexpected beauty and diversity in the structures of three homologous 4,5-dialkoxy-1-ethynyl-2-nitrobenzenes: the subtle interplay between intermolecular C—H...O hydrogen bonds and alkyl chain length

2017 ◽  
Vol 73 (10) ◽  
pp. 814-819 ◽  
Author(s):  
Shalisa M. Oburn ◽  
Eric Bosch
Keyword(s):  
Nmr Spectra ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Monoclinic Crystal System ◽  
Monoclinic Crystal ◽  
Triclinic Crystal System ◽  
Space Group ◽  
X Ray ◽  
Crystal System ◽  
C Nmr

The synthesis, 1H and 13C NMR spectra, and X-ray structures are described for three dialkoxy ethynylnitrobenzenes that differ only in the length of the alkoxy chain, namely 1-ethynyl-2-nitro-4,5-dipropoxybenzene, C14H17NO4, 1,2-dibutoxy-4-ethynyl-5-nitrobenzene, C16H21NO4, and 1-ethynyl-2-nitro-4,5-dipentoxybenzene, C18H25NO4. Despite the subtle changes in molecular structure, the crystal structures of the three compounds display great diversity. Thus, 1-ethynyl-2-nitro-4,5-dipropoxybenzene crystallizes in the trigonal crystal system in the space group R{\overline 3}, with Z = 18, 1,2-dibutoxy-4-ethynyl-5-nitrobenzene crystallizes in the monoclinic crystal system in the space group P21/c, with Z = 4, and 1-ethynyl-2-nitro-4,5-dipentoxybenzene crystallizes in the triclinic crystal system in the space group P{\overline 1}, with Z = 2. The crystal structure of 1-ethynyl-2-nitro-4,5-dipropoxybenzene is dominated by planar hexamers formed by a bifurcated alkoxy sp-C—H...O,O′ interaction, while the structure of the dibutoxy analogue is dominated by planar ribbons of molecules linked by a similar bifurcated alkoxy sp-C—H...O,O′ interaction. In contrast, the dipentoxy analogue forms ribbons of molecules alternately connected by a self-complementary sp-C—H...O2N interaction and a self-complementary sp 2-C—H...O2N interaction. Disordered solvent was included in the crystals of 1-ethynyl-2-nitro-4,5-dipropoxybenzene and its contribution was removed during refinement.

scholarly journals Stereospecific ligands and their complexes. VI. The crystal structure of (S,S)-ethylenediamine-N,N'-di-2-propanoic acid hydrochloride, (S,S)-H2eddp•HCl

2011 ◽  
Vol 76 (7) ◽  
pp. 995-1001 ◽  
Author(s):  
Verica Glodjovic ◽  
Gordana Radic ◽  
Snezana Stanic ◽  
Frank Heinemann ◽  
Srecko Trifunovic
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Propanoic Acid ◽  
1H And 13C Nmr ◽  
Triclinic Crystal System ◽  
Space Group ◽  
Crystal System ◽  
Acid Hydrochloride

(S,S)-Ethylenediamine-N,N'-di-2-propanoic acid hydrochloride, (S,S)-H2eddp?HCl, was prepared and its crystal structure determined. The compound was characterized by infrared and 1H- and 13C-NMR spectroscopy. It forms P1 in the space group of a triclinic crystal system with a = 5.3902(2) ?, b = 5.8967(2) ?, c = 10.3319(2) ?, ? = 99.625(2)?, ? = 91.645(2)?, ? = 109.995(2)? and Z = 1.

scholarly journals The Crystal Structure of bis-(μ-N-ethyl-Nphenyldithiocarbamato- S,S’)-bis[(N-ethyl-Nphenyldithiocarbamato- κ2S,S’)zinc(II)]

2021 ◽  
Author(s):  
Robert A Gossage ◽  
Hilary A Jenkins
Keyword(s):  
Crystal Structure ◽  
Metal Atom ◽  
Unit Cell ◽  
Secondary Amines ◽  
Triclinic Crystal System ◽  
Space Group ◽  
Crystal System ◽  
Cell Dimensions ◽  
R Value ◽  
Unit Cell Dimensions

The title material crystallises in the triclinic crystal system in space group P-1 with Z = 2. The unit cell dimensions are a = 8.7365(6)Å, b = 10.6009(7)Å, c = 12.0210(8)Å with α = 66.343(1)°, β = 79.566(1)°, γ = 83.150(1)° and V = 1001.6(1)Å3. The final R value is 0.0307 (3905 observed reflections: I >2σ(I)). The compound is best described as a species in which each metal atom is coordinated to two dithiocarbamato groups, one of which forms a secondary bridging interaction (through a S-atom) to a second [Zn(S2CNEtPh)2] unit. Thus, the title material is in the form of a dimeric aggregate. This complex is compared to related materials which contain N-atoms within the dithiocarbamato ligand that are derived from secondary amines containing two different organic functionalities.

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