Structure and Binding Properties of Four New Oligomeric Cyclophane Esters: 1,4-Xylylene 1,4-Phenylene Diacetates and Dipropionates

1998 ◽  
Vol 51 (5) ◽  
pp. 361 ◽  
Author(s):  
Donato Donati ◽  
Stefano Roelens ◽  
Riccardo Torriti ◽  
Giovanni Valle
Keyword(s):  
Crystal Structure ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Binding Properties ◽  
Binding Ability ◽  
X Ray ◽  
Structure Determinations

The X-ray crystal structure determinations of four new oligomeric cyclophane esters are reported. They are: (3a) monomeric 1,4-xylylene (1,4-phenylene)diacetate, P21/n (No. 14), a 5·959(5), b 15·795(5), c 8·094(5) Å, β 108·060(5)°, V 724·3(8) Å3 , Z 2, R1(2σ) 0·0522, wR2 0·125; (3b) monomeric 1,4-xylylene (1,4-phenylene)dipropionate, P21/c (No. 14), a 5·878(1), b 14·642(2), c 18·909(2) Å, β 96·00(10)°, V 1618·5(4) Å3 , Z 4, R1(2σ) 0·053, wR2 0·165; (3c) dimeric 1,4-xylylene (1,4-phenylene)diacetate, P-1 (No. 2), a 14·633(2), b 17·529(2), c 5·736(1) Å, α 98·30(10), β 90·60(10), γ 95·40(10)°, V 1449·0(4) Å3, Z 2, R1(2σ) 0·057, wR2 0·158; (3d) dimeric 1,4-xylylene (1,4-phenylene)dipropionate, P21/a (No. 14), a 8·145(1), b 11·379(2), c 17·401(2) Å, β 101·40(10)°, V 1580·9(4) Å3, Z 4, R1(2σ) 0·034, wR2 0·095. Monomeric cyclophanes (3a,b) exhibit a well defined cleft, while dimeric (3c,d) adopt a flat conformation devoid of cavities. Binding properties were determined by 1H n.m.r. titrations in CDCl3 at T = 296 K. Complexation experiments with quaternary ammonium salts revealed that host (3c) possesses appreciable binding ability toward N-methylpyridinium (–ΔG° = 5·9 kJ mol-1), tetramethylammonium (–ΔG° = 8·8 kJ mol-1) and acetylcholine (–ΔG° = 7·5 kJ mol-1) cations, despite its lack of a preorganized cavity.

Physical Properties of Nylon 66/Organoclay Nanocomposites

2006 ◽  
Vol 530-531 ◽  
pp. 702-708 ◽  
Author(s):  
Edcleide Maria Araújo ◽  
K.D. Araujo ◽  
Taciana Regina de Gouveia Silva
Keyword(s):  
Mechanical Properties ◽  
Infrared Spectroscopy ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
X Ray Diffraction ◽  
Rheological Characterization ◽  
Nylon 66 ◽  
X Ray ◽  
Organically Modified

Nanocomposites containing nylon 66 and montmorillonite clay organically modified with quaternary ammonium salts were obtained via direct melt intercalation. A montmorillonite sample from Boa Vista/PB, Northeast of Brazil, was treated with three types of quaternary ammonium salts such as Genamin, Praepagen and Cetremide. After the treatment, the powder was characterized by X-ray diffraction (XRD). The produced nanocomposites were characterized by Torque Rheometer, Infrared Spectroscopy (FTIR), mechanical properties and HDT. The obtained results for rheological characterization showed that the nanocomposites did not present deterioration with the presence of modified clay. Generally, the mechanical properties of tensile of the systems presented superior values compared to that of pure Ny 66. HDT's properties presented very interesting values for the nanocomposites and significantly larger than for pure nylon 66.

Iodo-bis(quaternary ammonium) salts. Potential cartilage-selective x-ray contrast agents

1976 ◽  
Vol 19 (11) ◽  
pp. 1349-1352 ◽  
Author(s):  
Steven P. Van Ootegham ◽  
Ronald G. Smith ◽  
G. Doyle Daves ◽  
Edwin M. Chang ◽  
Aziza El-Mazati ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
X Ray

ChemInform Abstract: IODO-BIS(QUATERNARY AMMONIUM) SALTS. POTENTIAL CARTILAGE-SELECTIVE X-RAY CONTRAST AGENTS

1977 ◽  
Vol 8 (10) ◽  
pp. no-no
Author(s):  
S. P. VAN OOTEGHAM ◽  
R. G. SMITH ◽  
G. D. JUN. DAVES ◽  
A. EL-MAZATI ◽  
E. M. CHAN ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
X Ray

scholarly journals Synthesis, cytotoxic evaluation and DNA binding study of 9-fluoro-6H-indolo[2,3-b]quinoxaline derivatives

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41869-41879 ◽  
Author(s):  
Zhenyu Gu ◽  
Yanci Li ◽  
Songliang Ma ◽  
Shenghui Li ◽  
Guoqiang Zhou ◽  
...  
Keyword(s):  
Dna Binding ◽  
Antitumor Activity ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Binding Study ◽  
Ammonium Salts ◽  
Binding Ability ◽  
Quinoxaline Derivatives

New quaternary ammonium salts of 9-fluoro-6H-indolo[2,3-b] derivatives were synthesized. These compounds possessed enhanced DNA binding ability and improved antitumor activity.

Study on Organic Modified of Montmorillonite by Corrosion Inhibitor of Quaternary Ammonium Salts

2013 ◽  
Vol 669 ◽  
pp. 103-107 ◽  
Author(s):  
Jian Guo Sheng ◽  
Ping Zeng
Keyword(s):  
Ion Exchange ◽  
Quaternary Ammonium ◽  
Interlayer Space ◽  
Quaternary Ammonium Salts ◽  
Raw Material ◽  
Ammonium Salts ◽  
X Ray Diffraction ◽  
Exchange Method ◽  
X Ray ◽  
Ion Exchange Method

A series of organic montomorilonite were prepared by using Sodium monanorilonite(Na-MMT) as raw material and quaternary ammonium salts with different chain long as intercalation agents by the way of ion exchange method. Weightlessness experiment showed that intercalated agents could alleviate the corrosion of metal. The MMT and organic MMT (OMMT) were identified by infrared spectra (FTIR) and X-ray diffraction (XRD). The results showed that intercalation agents had intercalated into the interlayer space of MMT, and the spacing of MMT layers had increased from 1.51 nm to 2.94 nm.

Study of Chocolate Clay (Boa Vista, Paraíba) Organophilization Using the Mixture of Quaternary Ammonium Salts through Direct Method

2014 ◽  
Vol 805 ◽  
pp. 672-677
Author(s):  
Wellington Siqueira Lima ◽  
Meiry Gláucia Freire Rodrigues ◽  
Mariaugusta Ferreira Mota ◽  
Aline Cadígena Lima Patrício ◽  
Marcílio Máximo Silva
Keyword(s):  
Quaternary Ammonium ◽  
Cation Exchange Capacity ◽  
Organic Molecules ◽  
Direct Method ◽  
Exchange Capacity ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Cation Exchange Capacity

The organoclays contain intercalated organic molecules in their structural layers. The more clay used to prepare organoclays are those derived from the smectite group bentonites mainly due to the small size of crystals and high cation exchange capacity, which facilitate the intercalation of organic compounds. This work aims to obtain organoclays from a mixture of two different quaternary ammonium salts in a 1:1 ratio through the direct method of organophilization. This procedure will be performed using the clay Chocolate from the municipality of Boa Vista, Paraíba state, which has in its composition of smectite clay minerals group. The samples were characterized by X-ray diffraction (XRD) and infrared spectroscopy (IR). The testing Foster swelling in a later step, using different organic solvents: gasoline, diesel and kerosene were used to investigate the compatibility clays after modification with the salts.

1010. Stereoisomeric pairs of cyclic quaternary ammonium salts. Part V. Derivatives of 4-aza-5α-cholestane

1965 ◽  
Vol 0 (0) ◽  
pp. 5439-5446 ◽  
Author(s):  
James McKenna ◽  
Jean M. McKenna ◽  
A. Tulley
Keyword(s):  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Derivatives Of

Synthesis and stability of 1-aminoalkylphosphonic acid quaternary ammonium salts

2021 ◽  
Author(s):  
Tomasz K. Olszewski ◽  
Anna Brol
Keyword(s):  
Phosphonic Acid ◽  
Quaternary Ammonium ◽  
Alkylating Agent ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Aminoalkylphosphonic Acid

An effective protocol for quaternization of simple 1-aminoalkylphosphonic acids under basic conditions and using Me2SO4 as convenient alkylating agent is reported. In the course of reaction phosphonic acid quaternary ammonium...

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