Beads-on-string-shaped polymers incorporating cage silsesquioxanes in the main chain, especially double-decker-shaped phenyl-substituted silsesquioxanes (DDSQ), have received significant attention in the past few decades. Difunctionalized isobutyl-substituted cage octasilsesquioxane (T8) have slso...

Novel boron complexes bearing pyrrole and π-expanded pyridine structures, such as quinoline, isoquinoline, and phenanthridine, were prepared. These compounds showed the fluorescence emission characters in both solution and solid state. Particularly, several complexes in solution exhibited high fluorescence quantum yield with Stokes shift values being four to five times larger than that of boron dipyrromethenes (BODIPYs). The present paper describes the optical properties of these novel boron complexes as well as their halogenated derivatives from the results of both experimental and computational studies.

Pnictogen-mediated Lewis acidity is an emerging research subject in organic chemistry, supramolecular chemistry, etc. In contrast to the extensive studies on phosphorus and antimony, the diversity of arsenic-Lewis acids was...

Halogenated and non‐halogenated boron complexes bearing pyrrole and π‐expanded pyridine structures, such as quinoline (for 1 a‐H, 1 a‐Cl, 1 a‐Br, and 1 a‐I), isoquinoline (for 1 b‐Br), and phenanthridine (for 1 c‐Br), were prepared to investigate their optical properties. Fluorescence studies of the different solid states revealed that the boron complexes 1 a‐H, 1 a‐Cl, and 1 a‐Br exhibit the mechanochromic properties. The present paper also examined the optical properties of other analogs 1 a‐I, 1 b‐Br, and 1 c‐Br both in‐solution and solid state. Moreover, the interrelationship between their emission character, molecule structures, and solid state were studied by X‐ray crystallographic analysis and X‐ray diffraction investigation.

Despite their potential for several transition-metalcatalyzed reactions, arsenic ligands are poorly diversified. In this work, we developed an efficient synthetic methodology for AB 2type ligands, which is a typical motif in phosphorus systems, for example, in Buchwald ligands. The introduction of 1,2benzenedithiol to tribromoarsine reduces the reactivity of two of the three reaction sites. After the substitution reaction with the first nucleophile involving the elimination of bromide, the substitution reaction with the second nucleophile produced AB 2 -type arsines through the elimination of the dithiolate anion. Among the various types of obtained AB 2 -type arsines, the arsa-Buchwald ligands, which are arsenic analogues of Buchwald ligands, were applied to the Suzuki−Miyaura cross-coupling reaction. Some of the arsa-Buchwald ligands showed activity comparable to that of the well-known Buchwald ligand, SPhos. Furthermore, the arsenic analogue of SPhos showed higher activity and stability than SPhos under open-air conditions.

The boron difluoride complex bearing 2‐(quinol‐8‐yl)pyrrole as a ligand was synthesized as well as its derivatives bearing aromatic ring substituents at the α‐position of the pyrrole moiety. These compounds showed the potentiality of good red emission character in spite of their simple structures. In the present paper, the details of their optical properties are described and discussed based on computational studies and X‐ray structural analysis.

A series of dibenzoarsacrowns were synthesized through a practical protocol. As and O preferentially coordinated to soft and hard cations, respectively. Positive allosteric effect was observed when coordinated to Au and Na cations.

The Suzuki–Miyaura coupling (SMC) reaction is one of the most commonly used cross-coupling reactions. Bulky biaryldialkyl monophosphine ligands, i.e., Buchwald ligands, are beneficial for the SMC reaction. We recently developed...