Naftopidil Molecular Salts with Improved Dissolution and Permeation

2020 ◽  
Vol 20 (5) ◽  
pp. 3064-3076 ◽  
Author(s):  
M. K. Chaitanya Mannava ◽  
Rambabu Dandela ◽  
Srinu Tothadi ◽  
K. Anand Solomon ◽  
Ashwini K. Nangia
Keyword(s):  
Molecular Salts

scholarly journals Crystal structures of two stilbazole derivatives: bis{(E)-4-[4-(diethylamino)styryl]-1-methylpyridin-1-ium} tetraiodidocadmium(II) and (E)-4-[4-(diethylamino)styryl]-1-methylpyridin-1-ium 4-methoxybenzenesulfonate monohydrate

2018 ◽  
Vol 74 (12) ◽  
pp. 1891-1894
Author(s):  
Priya Antony ◽  
S. Antony Inglebert ◽  
Jerald V. Ramaclus ◽  
S. John Sundaram ◽  
P. Sagayaraj
Keyword(s):  
Hydrogen Bonds ◽  
Rotation Axis ◽  
Stacking Interactions ◽  
Tetrahedral Coordination ◽  
Asymmetric Unit ◽  
Methyl Group ◽  
Diethyl Amine ◽  
Molecular Salts ◽  
Benzene Rings ◽  
Distorted Tetrahedral Coordination

The title molecular salts, (C18H23N2)2[CdI4], (I), and C18H23N2 +·C7H7O4S−·H2O, (II), are stilbazole, or 4-styrylpyridine, derivatives. The cation, (E)-4-[4-(diethylamino)styryl]-1-methylpyridin-1-ium, has a methyl group attached to pyridine ring and a diethyl amine group attached to the benzene ring. The asymmetric unit of salt (I), comprises one cationic molecule and half a CdI4 dianion. The Cd atom is situated on a twofold rotation axis and has a slightly distorted tetrahedral coordination sphere. In (II), the anion consists of a 4-methoxybenzenesulfonate and it crystallizes as a monohydrate. In both salts, the cations adopt an E configuration with respect to the C=C bond and the pyridine and benzene rings are inclined to each other by 10.7 (4)° in (I) and 4.6 (2)° in (II). In the crystals of both salts, the packing is consolidated by offset π–π stacking interactions involving the pyridinium and benzene rings, with centroid–centroid distances of 3.627 (4) Å in (I) and 3.614 (3) Å in (II). In the crystal of (II), a pair of 4-methoxybenzenesulfonate anions are bridged by Owater—H...Osulfonate hydrogen bonds, forming loops with an R 2 4(8) motif. These four-membered units are then linked to the cations by a number of C—H...O hydrogen bonds, forming slabs lying parallel to the ab plane.

scholarly journals Organic Salts and Merrifield Resin Supported [PM12O40]3− (M = Mo or W) as Catalysts for Adipic Acid Synthesis

Molecules ◽  
2019 ◽  
Vol 24 (4) ◽  
pp. 783 ◽  
Author(s):  
Jana Pisk ◽  
Dominique Agustin ◽  
Rinaldo Poli
Keyword(s):  
Adipic Acid ◽  
Acid Synthesis ◽  
Catalyst Loading ◽  
Aqueous Hydrogen Peroxide ◽  
Organic Salts ◽  
Solvent Free Conditions ◽  
Molecular Salts ◽  
Merrifield Resin ◽  
Low Catalyst Loading ◽  
Catalyzed Oxidation

Adipic acid (AA) was obtained by catalyzed oxidation of cyclohexene, epoxycyclohexane, or cyclohexanediol under organic solvent-free conditions using aqueous hydrogen peroxide (30%) as an oxidizing agent and molybdenum- or tungsten-based Keggin polyoxometalates (POMs) surrounded by organic cations or ionically supported on functionalized Merrifield resins. Operating under these environmentally friendly, greener conditions and with low catalyst loading (0.025% for the molecular salts and 0.001–0.007% for the supported POMs), AA could be produced in interesting yields.

scholarly journals Influence of charge order on the ground states of TMTTF molecular salts

2004 ◽  
Vol 114 ◽  
pp. 35-40 ◽  
Author(s):  
W. Yu ◽  
F. Zamborszky ◽  
B. Alavi ◽  
A. Baur ◽  
C. A. Merlic ◽  
...  
Keyword(s):  
Ground States ◽  
Charge Order ◽  
Molecular Salts

Calculation of the crystal densities of molecular salts and hydrates using additive volumes for charged groups

2003 ◽  
Vol 59 (4) ◽  
pp. 498-504 ◽  
Author(s):  
Sylvain Beaucamp ◽  
Nicolas Marchet ◽  
Didier Mathieu ◽  
Viatcheslav Agafonov
Keyword(s):  
Least Squares ◽  
Functional Groups ◽  
Organic Compounds ◽  
Molecular Crystals ◽  
Average Error ◽  
Standard Group ◽  
Least Squares Fit ◽  
Molecular Salts ◽  
Structural Database ◽  
Cell Volumes

Standard group volumes which can be used to estimate the crystal densities of molecular salts and hydrates are reported, as a complement to values derived recently for the functional groups of neutral organic compounds. These new parameters were derived from a least-squares fit of cell volumes for a set of 1132 ionic molecular crystals from the Cambridge Structural Database. Their values point to the unusual overlap between monovalent O atoms and neighbouring H atoms. Using the new group volumes presently obtained, the crystal densities of the salts are predicted with an average error of <2.5%, while previous atom-based schemes yield average errors of >3%. To illustrate the possible application of the present database, the problem of designing environmentally friendly propellants is addressed.

scholarly journals Solid-State Versatility of the Molecular Salts/Cocrystals of 2-Chloro-4-nitrobenzoic Acid: A Case Study on Halogen Bonds

ACS Omega ◽  
2017 ◽  
Vol 2 (10) ◽  
pp. 7146-7162 ◽  
Author(s):  
Madhavi Oruganti ◽  
Sunil Kumar Nechipadappu ◽  
Pavan A. Khade ◽  
Darshak R. Trivedi
Keyword(s):  
Solid State ◽  
Halogen Bonds ◽  
Nitrobenzoic Acid ◽  
Molecular Salts

From 3D channelled frameworks to 2D layered structures in molecular salts ofl-serine anddl-serine with oxalic acid

2013 ◽  
Vol 37 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Dario Braga ◽  
Laura Chelazzi ◽  
Iacopo Ciabatti ◽  
Fabrizia Grepioni
Keyword(s):  
Oxalic Acid ◽  
Layered Structures ◽  
Molecular Salts

From pipemidic acid molecular salts to metal complexes and BioMOFs using mechanochemistry

CrystEngComm ◽  
2021 ◽  
Author(s):  
Martin Zábranský ◽  
Paula C. Alves ◽  
Catarina Bravo ◽  
M. Teresa Duarte ◽  
Vânia André
Keyword(s):  
Metal Complexes ◽  
Pipemidic Acid ◽  
Crystal Forms ◽  
Molecular Salts ◽  
Old Drugs

Mechanochemistry has proven to be an excellent sustainable, efficient and fast tool for the discovery of new crystal forms of old drugs.

Supramolecular networks and Hirshfeld surfaces of oxydiacetic acid and iminodiacetic acid salts

2019 ◽  
Vol 75 (3) ◽  
pp. 449-458
Author(s):  
V. Gomathi ◽  
C. Theivarasu
Keyword(s):  
Iminodiacetic Acid ◽  
Intramolecular Proton Transfer ◽  
Zigzag Chain ◽  
One Dimensional ◽  
Molecular Salts ◽  
Hirshfeld Analysis ◽  
Supramolecular Networks ◽  
Oxydiacetic Acid ◽  
Supramolecular Chains

Oxydiacetic acid (Oda) and iminodiacetic acid (Ida) have been combined with two diamines, namely ethylenediamine (en) and o-phenylenediamine (o-phen), to give three molecular crystals of compositions [(Oda2−)(en2+)]·H2O (Odaen), [(Ida−)(0.5en+)] (Idaen) and [(Oda−)(o-phen+)] (Odaophen). Single crystal X-ray structure determination of the three molecular salts revealed that the hydrogen bonding interactions form distinct supramolecular chains. In Odaen, water molecules and Oda2− anions generate one-dimensional supramolecular chains where two chains overlap each other in zigzag form. In Odaophen, Oda− anions generate a one-dimensional linear supramolecular chain. In Idaen, both intermolecular and intramolecular proton transfer occurs. Ida− anions generate a one-dimensional zigzag chain. These one-dimensional supramolecular chains extend to form different two-dimensional supramolecular chains by the interaction of diaminium and monoaminium cations. Intermolecular close contacts are also examined using Hirshfeld analysis to reveal similarities and differences in the crystal structures.

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