J. Appl. Cryst.の発刊に際して

There is great need for stand-alone luminescence-based chemosensors that exemplify selectivity, sensitivity, and applicability and that overcome the challenges that arise from complex, real-world media. Discussed herein are recent developments toward these goals in the field of supramolecular luminescent chemosensors, including macrocycles, polymers, and nanomaterials. Specific focus is placed on the development of new macrocycle hosts since 2010, coupled with considerations of the underlying principles of supramolecular chemistry as well as analytes of interest and common luminophores. State-of-the-art developments in the fields of polymer and nanomaterial sensors are also examined, and some remaining unsolved challenges in the area of chemosensors are discussed.

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Supramolecular Luminescent Sensors

Purification of Laboratory Chemicals, Fourth Edition By W L FArmarego (Australian National University, The John Curtin School ofMedical Research) and DD Perrin (Australian National University,Formerly of the Medical Chemistry Group) Butterworth Heinemann Press:Oxford 1996 v + 529 pp ARP $19500 ISBN 0-7506-2839-1

https://www.mdpi.com/1420-3049/2/10/152/pdf

Purification of Laboratory Chemicals, Fourth Edition. By W. L. F.

Endowing both solvent independency and excellent thermal bistability, the benzobis(thiadiazole)-bridged diarylethene system provides an efficient approach to realize extremely high photocyclization quantum yields (Φo-c, up to 90.6 %) by both separating completely pure anti-parallel conformer and suppressing intramolecular charge transfer (ICT).

Separation of Photoactive Conformers Based on Hindered Diarylethenes: Efficient Modulation in Photocyclization Quantum Yields

Reversible ArS E aroylation has been observed in the reaction of 2,7-dimethoxynaphthalene (1) with 4-chlorobenzoic acid/acid chloride 2 with the aid of discrete acidic mediators. The reaction readily gives 1-aroylated-, 3-aroylated-, and 1,8-diaroylated products. The product distribution clearly shows dependence on the kind and strength of the acidic mediators and the time-course of the distribution manifests dearoylation of the productive aroylnaphthalenes. These reaction behaviors including acid-strength-dependent reversibility are well interpreted from the viewpoint of highly congested noncoplanar geometry of the polyaromatic ketone products.

Reversible ArSE Aroylation of Naphthalene Derivatives

Bisarylindenols: fixation of conformation leads to exceptional properties of photochromism based on 6π-electrocyclization.

The mol­ecule of the title compound, C26H20O4, is located on a twofold rotation axis. The two benzoyl groups are situated in an anti orientation. The dihedral angle between the mean planes of the phenyl ring and the naphthalene ring system is 80.25 (6)°. The phenyl and carbonyl groups in each benzoyl group are almost coplanar. The mol­ecular packing is stabilized by weak C—H⋯O hydrogen bonds and a π–π stacking inter­action between the phenyl rings [centroid–centroid and inter­planar distances of 3.6383 (10) and 3.294 A, respectively].

https://journals.iucr.org/e/issues/2008/05/00/is2282/is2282.pdf

1,8-Dibenzoyl-2,7-dimethoxy-naphthalene.

In the title compound, C19H15ClO3, the dihedral angle between the naphthalene ring system and the benzene ring is 72.06 (7)°. The 4-chloro­phenyl group and the carbonyl group are almost coplanar. An inter­molecular C—H⋯O hydrogen bond is formed between an H atom of the 4-chloro­phenyl group and the O atom of one meth­oxy group, forming a zigzag chain along the a axis.

https://journals.iucr.org/e/issues/2008/07/00/is2299/is2299.pdf

1-(4-Chloro-benzo-yl)-2,7-dimethoxy-naphthalene.

Unique and Specific Reaction Behavior and Characteristic Spatial Organization of Non-coplanarly Aromatic-ring-accumulated Molecular Compounds

The asymmetric unit of the title compound, C19H16O3, contains three independent conformers. Each of the three conformers has essentially the same feature of non-coplanar aromatic rings whereby the aroyl group at the 1-position of the naphthalene ring is twisted in a perpendicular manner to the naphthalene ring. The dihedral angles between the benzene ring planes and the naphthalene ring systems are 75.34 (7), 86.47 (7) and 76.55 (6)° in the three conformers. The crystal structure is stabilized by inter­molecular C—H⋯O hydrogen bonds.

https://journals.iucr.org/e/issues/2010/10/00/om2366/om2366.pdf

Akiko Okamoto

Papers

Bisarylindenols: fixation of conformation leads to exceptional properties of photochromism based on 6π-electrocyclization.

1,8-Dibenzoyl-2,7-dimethoxy-naphthalene.

1-(4-Chloro-benzo-yl)-2,7-dimethoxy-naphthalene.

Unique and Specific Reaction Behavior and Characteristic Spatial Organization of Non-coplanarly Aromatic-ring-accumulated Molecular Compounds

(2,7-Dimeth-oxy-naphthalen-1-yl)(phen-yl)methanone.