scholarly journals A detailed comparative structural study of the hydrogen bonded networks in solids, obtained by the reaction of 4,4′-bipyridine and varied alkane-α,ω-diphosphonic acids

CrystEngComm ◽  
2016 ◽  
Vol 18 (20) ◽  
pp. 3574-3584 ◽  
Author(s):  
M. van Megen ◽  
W. Frank ◽  
G. J. Reiss
Keyword(s):  
Structural Study ◽  
Diphosphonic Acids ◽  
Hydrogen Bonded

Structural study of six cycloalkylammonium cinnamate salt structures featuring one-dimensional columns and two-dimensional hydrogen-bonded networks

2012 ◽  
Vol 68 (5) ◽  
pp. o188-o194 ◽  
Author(s):  
Andreas Lemmerer ◽  
Manuel A. Fernandes
Keyword(s):  
Hydrogen Bonds ◽  
Structural Study ◽  
Two Dimensional ◽  
One Dimensional ◽  
Dimensional Network ◽  
Polymorphic Forms ◽  
Whole Molecule Disorder ◽  
Hydrogen Bonded

Six ammonium carboxylate salts, namely cyclopentylammonium cinnamate, C5H12N+·C9H7O2−, (I), cyclohexylammonium cinnamate, C6H14N+·C9H7O2−, (II), cycloheptylammonium cinnamate form I, C7H16N+·C9H7O2−, (IIIa), and form II, (IIIb), cyclooctylammonium cinnamate, C8H18N+·C9H7O2−, (IV), and cyclododecylammonium cinnamate, C12H26N+·C9H7O2−, (V), are reported. Salts (II)–(V) all have a 1:1 ratio of cation to anion and feature three N+—H...O−hydrogen bonds forming one-dimensional hydrogen-bonded columns consisting of repeatingR43(10) rings, while salt (I) has a two-dimensional network made up of alternatingR44(12) andR68(20) rings. Salt (III) consists of two polymorphic forms,viz.form I havingZ′ = 1 and form II withZ′ = 2. The latter polymorph has disorder of the cycloheptane rings in the two cations, as well as whole-molecule disorder of one of the cinnamate anions. A similar, but ordered,Z′ = 2 structure is seen in salt (IV).

A comparative structural study of alkane- α,ω-diphosphonic acids

2015 ◽  
Vol 230 (7) ◽  
Author(s):  
Martin van Megen ◽  
Walter Frank ◽  
Guido J. Reiss
Keyword(s):  
Solid State ◽  
Structural Study ◽  
Homologous Series ◽  
Diphosphonic Acids ◽  
Solid State Structures

AbstractIn a comparative structural study, the solid state structures within the homologous series of alkane-

Structural study of hydrogen-bonded complexes between 2-aminoethanol derivatives and a chiral aromatic alcohol

2004 ◽  
Vol 692 (1-3) ◽  
pp. 127-137 ◽  
Author(s):  
Nathalie Seurre ◽  
Katia Le Barbu-Debus ◽  
Françoise Lahmani ◽  
Anne Zehnacker-Rentien ◽  
Jerzy Sepiol
Keyword(s):  
Structural Study ◽  
Aromatic Alcohol ◽  
Bonded Complexes ◽  
Hydrogen Bonded

Structural study of the hydrogen-bonded 1-naphthol⋅(NH3)2 cluster

2003 ◽  
Vol 118 (20) ◽  
pp. 9157-9166 ◽  
Author(s):  
Christian Tanner ◽  
Debora Henseler ◽  
Samuel Leutwyler ◽  
Leslie L. Connell ◽  
Peter M. Felker
Keyword(s):  
Structural Study ◽  
Hydrogen Bonded

scholarly journals A structural study of 2,4-dimethylaniline derivatives

2018 ◽  
Vol 74 (9) ◽  
pp. 1276-1280
Author(s):  
Samuel C. Penner ◽  
Maryam Kalvandi ◽  
Jamie S. Ritch
Keyword(s):  
Small Molecules ◽  
Structural Study ◽  
Type I ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
First Time ◽  
Hydrogen Bonded

Crystallographic studies of nitrogen-containing small molecules aid in the elucidation of their structure–activity relationships and modes of aggregation. In this study, two previously synthesized molecules are crystallographically characterized for the first time. Reaction of 2,4-dimethylaniline with N-bromosuccinimide affords the ortho-brominated derivative 2-bromo-4,6-dimethylaniline (1; C8H10BrN), which sublimates in vacuo to afford crystals featuring hydrogen-bonded chains as well as Type I halogen–halogen interactions. Conversely, alkylation of two equivalents of 2,4-dimethylaniline with 1,2-dibromoethane affords a separable mixture of N,N′-bis(2,4-dimethylphenyl)piperazine (2; C20H26N2), which was crystallographically characterized, as well as N,N′-bis(2,4-dimethylphenyl)ethylenediamine (3).

An Ultra-Structural Study of Human Melanoma in Vivo and Vitro

1976 ◽  
Vol 34 ◽  
pp. 258-259
Author(s):  
James R. Gaylor ◽  
Fredda Schafer ◽  
Robert E. Nordquist
Keyword(s):  
Endoplasmic Reticulum ◽  
Golgi Apparatus ◽  
Protein Aggregation ◽  
Structural Study ◽  
Human Melanoma ◽  
Protein Matrix ◽  
Early Form ◽  
Endoplasmic Reticulum Protein ◽  
Mitochondrial Origin

Several theories on the origin of the melanosome exist. These include the Golgi origin theory, in which a tyrosinase-rich protein is "packaged" by the Golgi apparatus, thus forming the early form of the melanosome. A second theory postulates a mitochondrial origin of melanosomes. Its author contends that the melanosome is a modified mitochondria which acquires melanin during its development. A third theory states that a pre-melanosome is formed in the smooth or rough endoplasmic reticulum. Protein aggregation is suggested by one author as a possible source of the melanosome. This fourth theory postulates that the melanosome originates when the protein products of several genetic loci aggregate in the cytoplasm of the melanocyte. It is this protein matrix on which the melanin is deposited. It was with these theories in mind that this project was undertaken.

Structural study of LiPO3-TeO2 glasses

1997 ◽  
Vol 222 (1-2) ◽  
pp. 131-136
Author(s):  
K Muruganandam
Keyword(s):  
Structural Study
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