CENTROSYMMETRIC DIMERS
![3 tert Butyl 1 (4 chlorophenyl) 7,7 dimethyl 5,6,7,8 tetrahydropyrazolo[3,4 b]quinolin 5 one: centrosymmetric dimers generated by C—H⋯π(arene) hydrogen bonds](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==)
3 tert Butyl 1 (4 chlorophenyl) 7,7 dimethyl 5,6,7,8 tetrahydropyrazolo[3,4 b]quinolin 5 one: centrosymmetric dimers generated by C—H⋯π(arene) hydrogen bonds
... The principal difference between (I) and (II) arises from the intermolecular aggregation. In (I), the molecules are linked into centrosymmetric dimers by two pairs of CÐH (arene) interactions (Table 1). ...
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Formation of non centrosymmetric dimers in (1S*,4aR*,8aR*) decahydronaphthalene 1 carboxylic acid
... non-centrosymmetric dimers arise most frequently in chiral non-racemates, where no centrosymmetry is possible (Gavezzotti & Filippini, 1994; Allen et ...of dimers lacking any element of symmetry ...
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3 (5 Chloro 3 methyl 1 phenylpyrazol 4 yl) 1,5 di 2 thienylpentane 1,5 dione: centrosymmetric dimers formed by C—H⋯π(thiophene) hydrogen bonds
... The supramolecular aggregation is determined by C— H (thiophene) hydrogen bonds (Table 1). Atom C8 in the molecule at (x, y, z) acts as a hydrogen-bond donor to the disordered thiophene ring of the molecule at (1 x, 1 y, ...
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(E) 3 (1,3 Benzodioxol 4 yl) 2 (4 bromophenyl)acrylic acid
... (I), centrosymmetric dimers are formed via O—H O hydrogen bonds involving the carboxylic acid groups ...These dimers are further linked by C—H Br and C—H O hydrogen bonds, forming a layer-like ...
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2 Methyl 7 oxo 5,6,7,8 tetrahydropyrimido[4,5 d]pyrimidin 3 ium chloride, a product of the thermal decomposition of nimustine hydrochloride (ACNU)
... product of the thermal decomposition of nimustine hydro- chloride (ACNU). In the crystal structure, intermolecular NÐ H O hydrogen bonds link the cations into centrosymmetric dimers, which are further ...
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Saccharin, redetermined at 120 K: a three dimensional hydrogen bonded framework
... The structure of saccharin, (I), was determined some years ago (Bart, 1968; Okaya, 1969) using diffraction data collected at ambient temperature, and accordingly the precision of some of the interatomic distances is ...
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Tetramethylguanidinium chloride
... The classical hydrogen bonds of the form N+—H···Cl- Table 2 link the formula units into discrete centrosymmetric dimers Fig.. Further contacts of the form C—H···Cl-, the shortest of whic[r] ...
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2 Oxo 2H chromen 4 yl 4 methylbenzoate
... Figure 2 Crystal packing, showing the R228 centrosymmetric dimers stacked by hydrogen bonds to form R2218 and R3216 ring motifs.. Dashed lines indicate hydrogen bonds.[r] ...
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5 (2 Hydroxyphenyl) 4 (p tolyl) 2,4 dihydro 1,2,4 triazole 3 thione
... form centrosymmetric dimers through strong NÐ H S hydrogen bonds, with an N S distance of ...The dimers are connected through weak intermolecular CÐH S hydrogen bonds into chains in the c direction, ...
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Ethyl 2 amino 4 phenyl 4H benzo[h]chromene 3 carboxylate
... In the molecule of (I), (Fig. 1), all bond lengths and angles (Table 1) are normal. The intramolecular N—H···O hydrogen bond (Table 2) defines the orientation of carboxylate group. In the crystal structure, weak ...
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Crystal structure analysis of [5 (4 methoxyphenyl) 2 methyl 2H 1,2,3 triazol 4 yl](thiophen 2 yl)methanone
... hydrogen-bonded centrosymmetric dimers, C—H O and C—H S hydrogen bonds and S and – stacking interactions which, together, lead to the formation of a layered crystal ...
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4 [(2 Hydroxyphenylamino)phenylmethylene] 5 methyl 2 phenyl 2H pyrazol 3(4H) one
... Pairs of intermolecular OÐH O hydrogen bonds link molecules into centrosymmetric dimers, with the formation of a 14-membered ring Fig.. Wang, Zhang and Miao..[r] ...
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Ethyl 2 amino 4 (4 methylphenyl) 4H benzo[f]chromene 3 carboxylate
... The bond lengths and angles in (I) show normal values (Table 1). In the title molecule, the naphthalene ring system is planar within ±0.014 (3) Å. The pyran ring adopts a flattened boat conformation, with atoms O1 and C3 ...
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Centrosymmetric π stacked dimers in 5 (2 acetyloxyphenyl) 3 phenyl 1,2,4 oxadiazole
... While there are no hydrogen bonds of the CÐH O, CÐ H N or CÐH...(arene) types within the structure, the molecules are, however, weakly linked into centrosymmetric dimers by a single ± stacking interaction. ...
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4 [(E) 2 Ferrocenylethenyl] 1,8 naphthalic anhydride
... I centrosymmetric dimers are formed through strong complementary π-π interactions between the substituted ferrocene rings and the heterocyclic pyrandione rings [C1, C6, C7, C11, C12, ...These dimers ...
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Association of Protein Helices and Assembly of Foldamers: Stories in Membrane and Aqueous Environments
... helix-helix dimers propels our understanding of helix-helix ...GxxxG-containing dimers tend to have a parallel, right-handed geometry, compact helix-helix packing [11] and stabilizing interhelical backbone ...
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Comparative Analysis of gO Isoforms Reveals that Strains of Human Cytomegalovirus Differ in the Ratio of gH/gL/gO and gH/gL/UL128-131 in the Virion Envelope
... Since unbound gH/gL dimers are poorly transported out of the ER and since the presence of UL128-131 in the virion exactly correlates with the detection of gH/gL dimers, these data strong[r] ...
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Trace inequalities for positive semidefinite matrices with centrosymmetric structure
... Trace inequalities for positive semidefinite matrices with centrosymmetric structure Di Zhao1, Hongyi Li1* and Zhiguo Gong2 * Correspondence: [email protected] 1 LMIB, School of Math[r] ...
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Effect of the linking unit on the twist-bend nematic phase in liquid crystal dimers : a comparative study of two homologous series of methylene- and ether-linked dimers
... Figure 7: Energy minimised geometries of compounds 1 and 14 showing the differences in intermesogen angle (θ). Geometry optimised at the B3LYP/6-31G(d) level of DFT. The intermesogen angle of all trans conformer of the ...
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Chromatin remodelers as active Brownian dimers
... Thus, performing the average the T -dependent terms - which are themselves small within our approximation - cancel each other out exactly , as they should on general grounds: in the abse[r] ...
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