Monocationic gold(iii) Gly-l-His and l-Ala-l-His dipeptide complexes: crystal structures arising from solvent free and solvent-containing crystal formation and structural modifications tuned by counter-anions

2010 ◽  
Vol 39 (38) ◽  
pp. 8906 ◽  
Author(s):  
Urszula Rychlewska ◽  
Beata Warżajtis ◽  
Biljana Đ. Glišić ◽  
Marija D. Živković ◽  
Snežana Rajković ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Solvent Free ◽  
Crystal Formation ◽  
Structural Modifications

Conflicting Behavior of a Versatile Host Compound: X-ray Crystal Structures Arising from Solvent-free and Solvent-Containing Crystal Formation†

2010 ◽  
Vol 10 (2) ◽  
pp. 862-869 ◽  
Author(s):  
Konstantinos Skobridis ◽  
Vassiliki Theodorou ◽  
Wilhelm Seichter ◽  
Edwin Weber
Keyword(s):  
Crystal Structures ◽  
Solvent Free ◽  
Crystal Formation ◽  
X Ray ◽  
Host Compound

The crystal structures of solvent-free alkali-metal squarates from powder diffraction data

2005 ◽  
Vol 220 (11) ◽  
Author(s):  
Robert E. Dinnebier ◽  
Hanne Nuss ◽  
Martin Jansen
Keyword(s):  
High Resolution ◽  
Alkali Metal ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Room Temperature ◽  
Solvent Free ◽  
Crystallographic Data ◽  
Powder Diffraction Data ◽  
X Ray

AbstractThe crystal structures of solvent-free lithium, sodium, rubidium, and cesium squarates have been determined from high resolution synchrotron and X-ray laboratory powder patterns. Crystallographic data at room temperature of Li

Solvent–guest control of two extremely similar tetrahydrofuran inclusion structures

2014 ◽  
Vol 70 (1) ◽  
pp. 126-131 ◽  
Author(s):  
Jiabin Gao ◽  
Mohan M. Bhadbhade ◽  
Roger Bishop
Keyword(s):  
Crystal Structures ◽  
Inclusion Compounds ◽  
Crystal Form ◽  
Solvent Free ◽  
Guest Molecules ◽  
Crystal Forms ◽  
X Ray

Racemic 2,4,6,8-tetracarbomethoxybicyclo[3.3.0]octa-2,6-diene-3,7-diol, C16H18O10(1), was known previously to yield two solvent-free polymorphs and also a clathrate inclusion crystal form. Crystallization of (1) yields two inclusion compounds containing tetrahydrofuran (THF): (1)4·THF is obtained from a mixture of THF and methanol, whereas (1)2·THF is obtained from pure THF. The X-ray crystal structures reveal that the two compounds are extremely similar and that their host arrangements are essentially identical. They differ, however, in the proportion, orientation and host–guest interaction of the included THF molecules. The disordered guest molecules in (1)4·THF are oriented along the guest channel direction, whereas in (1)2·THF they lie across the channel. This unusual solvent–guest control of inclusion structures has implications relating to the formation of polymorphic structures and other competing crystal forms.

Preparation of Novel Unsymmetrical Bisindoles under Solvent-Free Conditions:  Synthesis, Crystal Structures, and Mechanistic Aspects

2007 ◽  
Vol 72 (23) ◽  
pp. 8847-8858 ◽  
Author(s):  
Hanns Martin Kaiser ◽  
Ivo Zenz ◽  
Wei Fun Lo ◽  
Anke Spannenberg ◽  
Kristin Schröder ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Solvent Free ◽  
Solvent Free Conditions

scholarly journals Crystal structures of ten enantiopure Schiff bases bearing a naphthyl group

2016 ◽  
Vol 72 (4) ◽  
pp. 583-589 ◽  
Author(s):  
Guadalupe Hernández-Téllez ◽  
Gloria E. Moreno ◽  
Sylvain Bernès ◽  
Angel Mendoza ◽  
Oscar Portillo ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Schiff Bases ◽  
Conformational Flexibility ◽  
Solvent Free ◽  
Intermolecular Contacts ◽  
Methyl Naphthalene

Using a general solvent-free procedure for the synthesis of chiral Schiff bases, the following compounds were synthesized and their crystal structures determined: (S)-(+)-2-{[(1-phenylethyl)imino]methyl}naphthalene, C19H17N, (1), (S)-(+)-2-({[(4-methylphenyl)ethyl]imino}methyl)naphthalene, C20H19N, (2), (R)-(−)-2-({[(4-methoxylphenyl)ethyl]imino}methyl)naphthalene, C20H19NO, (3), (R)-(−)-2-({[(4-fluorophenyl)ethyl]imino}methyl)naphthalene, C19H16FN, (4), (S)-(+)-2-({[(4-chlorophenyl)ethyl]imino}methyl)naphthalene, C19H16ClN, (5), (S)-(+)-2-({[(4-bromophenyl)ethyl]imino}methyl)naphthalene, C19H16BrN, (6), (S)-(+)-2-({[1-(naphthalen-1-yl)ethyl]imino}methyl)naphthalene, C23H19N, (7), (S)-(+)-2-{[(1-cyclohexylethyl)imino]methyl}naphthalene, C19H23N, (8), (S)-(−)-2-{[(1,2,3,4-tetrahydronaphthalen-1-yl)imino]methyl}naphthalene, C21H19N, (9), and (+)-2-({[(1S,2S,3S,5R)-2,6,6-trimethylbicyclo[3.1.1]hept-3-yl]imino}methyl}naphthalene, C21H25N, (10). The moiety provided by the amine generates conformational flexibility for these imines. In the crystals, no strong intermolecular contacts are observed, in spite of the presence of aromatic groups.

Two terphenyl-based diol hosts and corresponding solvent inclusions with dimethylformamide and acetonitrile

2015 ◽  
Vol 71 (9) ◽  
pp. 768-775
Author(s):  
Hendrik Klien ◽  
Wilhelm Seichter ◽  
Konstantinos Skobridis ◽  
Edwin Weber
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Structures ◽  
Solvent Molecule ◽  
Intramolecular Hydrogen Bonding ◽  
Host Lattice ◽  
Solvent Free ◽  
Guest Molecules ◽  
Solvent Molecules ◽  
Intramolecular Hydrogen ◽  
Supramolecular Aggregates

Having reference to an elongated structural modification of 2,2′-bis(hydroxydiphenylmethyl)biphenyl, (I), the two 1,1′:4′,1′′-terphenyl-based diol hosts 2,2′′-bis(hydroxydiphenylmethyl)-1,1′:4′,1′′-terphenyl, C44H34O2, (II), and 2,2′′-bis[hydroxybis(4-methylphenyl)methyl]-1,1′:4′,1′′-terphenyl, C48H42O2, (III), have been synthesized and studied with regard to their crystal structures involving different inclusions,i.e.(II) with dimethylformamide (DMF), C44H34O2·C2H6NO, denoted (IIa), (III) with DMF, C48H42O2·C2H6NO, denoted (IIIa), and (III) with acetonitrile, C48H42O2·CH3CN, denoted (IIIb). In the solvent-free crystals of (II) and (III), the hydroxy H atoms are involved in intramolecular O—H...π hydrogen bonding, with the central arene ring of the terphenyl unit acting as an acceptor. The corresponding crystal structures are stabilized by intermolecular C—H...π contacts. Due to the distinctive acceptor character of the included DMF solvent species in the crystal structures of (IIa) and (IIIa), the guest molecule is coordinated to the hostviaO—H...O=C hydrogen bonding. In both crystal structures, infinite strands composed of alternating host and guest molecules represent the basic supramolecular aggregates. Within a given strand, the O atom of the solvent molecule acts as a bifurcated acceptor. Similar to the solvent-free cases, the hydroxy H atoms in inclusion structure (IIIb) are involved in intramolecular hydrogen bonding, and there is thus a lack of host–guest interaction. As a result, the solvent molecules are accommodated as C—H...N hydrogen-bonded inversion-symmetric dimers in the channel-like voids of the host lattice.

scholarly journals Stoichiometric Control of Co-Crystal Formation by Solvent Free Continuous Co-Crystallization (SFCC)

2015 ◽  
Vol 15 (12) ◽  
pp. 5648-5651 ◽  
Author(s):  
Chaitrali Kulkarni ◽  
Clive Wood ◽  
Adrian L. Kelly ◽  
Tim Gough ◽  
Nicholas Blagden ◽  
...  
Keyword(s):  
Solvent Free ◽  
Crystal Formation

Structural variety of aluminium and gallium coordination polymers based on bis-pyridylethylene: from molecular complexes to ionic networks

CrystEngComm ◽  
2020 ◽  
Vol 22 (27) ◽  
pp. 4531-4543
Author(s):  
Nikita Y. Gugin ◽  
Alexander Virovets ◽  
Eugenia Peresypkina ◽  
Elena I. Davydova ◽  
Alexey Y. Timoshkin
Keyword(s):  
Crystal Structures ◽  
Coordination Polymers ◽  
Molecular Complexes ◽  
Solvent Free ◽  
Structural Variety

Diverse molecular (0D and 1D) as well as ionic (0D, 1D, 2D, mixed 1D–2D) crystal structures of complexes of aluminium and gallium trihalides with bis(4-pyridylethylene) were obtained by solvent-free melt reactions.

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