Restricting the geometrical relaxation in four-coordinate copper(i) complexes using face-to-face and edge-to-face π-interactions

CrystEngComm ◽  
2011 ◽  
Vol 13 (7) ◽  
pp. 2742 ◽  
Author(s):  
Edwin C. Constable ◽  
Catherine E. Housecroft ◽  
Peter Kopecky ◽  
Ewald Schönhofer ◽  
Jennifer A. Zampese
Keyword(s):  
Face To Face ◽  
Π Interactions

Use of simultaneous face to face and face to edge π-π interactions to facilitate chiral recognition

1994 ◽  
Vol 5 (5) ◽  
pp. 777-780 ◽  
Author(s):  
William H. Pirkle ◽  
Christopher J. Welch
Keyword(s):  
Chiral Recognition ◽  
Face To Face ◽  
Π Interactions

scholarly journals A mutually stabilized host-guest pair

2019 ◽  
Vol 5 (11) ◽  
pp. eaax6707 ◽  
Author(s):  
Chi Zhang ◽  
Hongye Wang ◽  
Jie Zhong ◽  
Ye Lei ◽  
Renfeng Du ◽  
...  
Keyword(s):  
Click Chemistry ◽  
Uv Light ◽  
Alder Reaction ◽  
Diels Alder ◽  
Protecting Group ◽  
Face To Face ◽  
Π Interactions ◽  
Diels Alder Reaction

By using click chemistry, a hexacationic cage was synthesized. The cage contains two triscationic π-electron–deficient trispyridiniumtriazine (TPZ3+) platforms that are bridged in a face-to-face manner by three ethylene-triazole-ethylene linkers. A diversity of π-electron–rich guests can be recognized within the pocket of the cage, driven by host-guest π-π interactions. The cage cavity acts as a protecting group, preventing an anthracene guest from undergoing Diels-Alder reaction. Under ultraviolet (UV) light, the pyridinium C─N bonds in TPZ3+ platforms are polarized and weakened, resulting in the occurrence of cage decomposition via β-elimination. Guest recognition could help to prevent this UV-stimulated cage decomposition by suppressing the excitation of the TPZ3+ units.

The Syntheses and Structures of Two New Zn(II) Complexes Based on 3-Nitrobenzoato Ligand

2013 ◽  
Vol 807-809 ◽  
pp. 2671-2674
Author(s):  
Ying Bing Lu ◽  
Fang Mei Jian ◽  
Shuang Jin
Keyword(s):  
Single Crystal ◽  
Coordination Polymers ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Face To Face ◽  
Π Interactions ◽  
Carboxylate Groups ◽  
Supramolecular Chain ◽  
Supramolecular Layer

Two new Zn (II) coordination polymers with 3-nitrobenzoato ligands have been prepared, and their structures have been characterized by single-crystal X-ray diffraction techniques. The structure of [Zn (3-nbz)2(μ-4,4'-bpy)]n(1) (3-nbz = 3-nitrobenzoato, 4,4'-bpy = 4,4'-bipyridine) shows 1-D chains originating from terminal 3-nbz ligands andμ-4,4'-bpy molecules. The chains are further connected through face-to-face π stacking interactions to genenate a 2-D supramolecular layer. In Zn (3-nbz)2(2,2'-bpy) (2) (2,2'-bpy = 2,2'-bipyridine), carboxylate groups exhibit chelated bidentate to give discrete mononuclear units, which are linked by face-to-face π-π and C-H···π interactions to produce a 1-D supramolecular chain.

A successive layer-by-layer assembly of supramolecular frameworks driven by a novel type of face-to-face π+–π+ interactions

CrystEngComm ◽  
2013 ◽  
Vol 15 (39) ◽  
pp. 7879 ◽  
Author(s):  
Prankrishna Manna ◽  
Saikat Kumar Seth ◽  
Monojit Mitra ◽  
Amrita Das ◽  
N. Jiten Singh ◽  
...  
Keyword(s):  
Layer By Layer ◽  
Face To Face ◽  
Π Interactions ◽  
Successive Layer ◽  
Layer By Layer Assembly ◽  
Layer Assembly

Formation of bilayer structure through face-to-face π–π interactions

2009 ◽  
Vol 920 (1-3) ◽  
pp. 14-17 ◽  
Author(s):  
Lei Jia ◽  
Ning Tang ◽  
Jagadese J. Vittal
Keyword(s):  
Bilayer Structure ◽  
Face To Face ◽  
Π Interactions

Supramolecular networks supported by the anion...π linkage of Keggin-type heteropolyoxotungstates

2020 ◽  
Vol 76 (8) ◽  
pp. 753-762
Author(s):  
Olha S. Panteleieva ◽  
Vira V. Ponomarova ◽  
Alexander V. Shtemenko ◽  
Kostiantyn V. Domasevitch
Keyword(s):  
Hydrogen Bonding ◽  
Dominant Role ◽  
Special Kind ◽  
Face To Face ◽  
Π Interactions ◽  
Keggin Type ◽  
Aromatic Substrates ◽  
Governing Factor ◽  
Supramolecular Networks ◽  
Stacking Patterns

Anion...π interactions are newly recognized weak supramolecular forces which are relevant to many types of electron-deficient aromatic substrates. Being less competitive with respect to conventional hydrogen bonding, anion...π interactions are only rarely considered as a crystal-structure-defining factor. Their significance dramatically increases for polyoxometalate (POM) species, which offer extended oxide surfaces for maintaining dense aromatic/inorganic stacks. The structures of tetrakis(caffeinium) μ12-silicato-tetracosa-μ2-oxido-dodecaoxidododecatungsten trihydrate, (C8H11N4O2)4[SiW12O40]·3H2O, (1), and tris(theobrominium) μ12-phosphato-tetracosa-μ2-oxido-dodecaoxidododecatungsten ethanol sesquisolvate, (C7H9N4O2)3[PW12O40]·1.5C2H5OH, (2), support the utility of anion...π interactions as a special kind of supramolecular synthon controlling the structures of ionic lattices. Both caffeinium [(HCaf)+ in (1)] and theobrominium cations [(HTbr)+ in (2)] reveal double stacking patterns at both axial sides of the aromatic frameworks, leading to the generation of anion...π...anion bridges. The latter provide the rare face-to-face linkage of the anions. In (1), every square face of the metal–oxide cuboctahedra accepts the interaction and the above bridges yield flat square nets, i.e. {(HCaf+)2[SiW12O40]4−} n . Two additional cations afford single stacks only and they terminate the connectivity. Salt (2) retains a two-dimensional (2D) motif of square nets, with anion...π...anion bridges involving two of the three (HTbr)+ cations. The remaining cations complete a fivefold anion...π environment of [PW12O40]3−, acting as terminal groups. This single anion...π interaction is influenced by the specific pairing of (HTbr)+ cations by double amide-to-amide hydrogen bonding. Nevertheless, invariable 2D patterns in (1) and (2) suggest the dominant role of anion...π interactions as the structure-governing factor, which is applicable to the construction of noncovalent linkages involving Keggin-type oxometalates.

scholarly journals The Ingenious Synthesis of a Nitro-Free Insensitive High-Energy Material Featuring Face-to-Face and Edge-to-Face π-Interactions

2019 ◽  
Vol 7 ◽  
Author(s):  
Lianjie Zhai ◽  
Fuqiang Bi ◽  
Huan Huo ◽  
Yifen Luo ◽  
Xiangzhi Li ◽  
...  
Keyword(s):  
High Energy ◽  
Face To Face ◽  
Π Interactions ◽  
Energy Material ◽  
High Energy Material

scholarly journals N,N,N′,N′-Tetrakis(pyridin-4-yl)methanediamine monohydrate

2012 ◽  
Vol 68 (6) ◽  
pp. o1600-o1600
Author(s):  
Jong Won Shin ◽  
Kil Sik Min
Keyword(s):  
Hydrogen Bonds ◽  
Water Molecule ◽  
Title Compound ◽  
Organic Molecules ◽  
Lattice Water Molecule ◽  
Face To Face ◽  
Π Interactions ◽  
Twofold Axis ◽  
Lattice Water ◽  
Compound C

In the title compound, C21H18N6·H2O, two 4,4′-dipyridylamine groups are linked by a methylene C atom, which sits on a twofold axis. The lattice water molecule is located slightly off a twofold axis, and is therefore disordered over two positions. In the crystal, the organic molecules and the water molecule are linked by O—H...N hydrogen bonds. The organic molecules exhibit extensive offset face-to-face π–π interactions to symmetry equivalents [centroid–centroid distances = 3.725 (3) and 4.059 (3) Å].

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