Preparation, structural and thermal studies of boroxine adducts having aryl boronic acids and pyrazoles

Structural Induction via Solvent Variation in Assemblies of Triphenylboroxine and Piperazine—Potential Application as Self-Assembly Molecular Sponge

“…The N→B bond distances in 1a·THF (1.702 and 1.707 Å) are practically identical to those in 1a·Acetone (1.694 and 1.699 Å). For comparison, N→B bond distances for monoadducts (ArBO) 3 L and 1:2 adducts (PhBO) 3 ·2L with Ar = aryl and L = aliphatic or aromatic N-donor ligand have values in the range of 1.61–1.67 Å and 1.64–1.74 Å, respectively. − ,− , The coordination geometry around the sp 3 boron atoms in 1a·THF and 1a·Acetone corresponds to a distorted tetrahedron with bond angles in the range of 101.3–115.7°. The third noncoordinated boron atom has a trigonal-planar geometry with angles between 117.6° and 122.9°.…”

“…For comparison, N→B bond distances for monoadducts (ArBO) 3 L and 1:2 adducts (PhBO) 3 •2L with Ar = aryl and L = aliphatic or aromatic N-donor ligand have values in the range of 1.61−1.67 Å and 1.64−1.74 Å, respectively. [65][66][67][68][69][70][71][72][73][79][80][81][82][83]91 The coordination geometry around the sp 3 The propagation of neighboring chains in compounds 1a• THF and 1a•Acetone generates pseudocavities, which are filled by the corresponding solvent (Figure 2). In both cases, the oxygen atom of the solvent is involved in the formation of asymmetric 4c).…”

“…Derivatives of boronic acids have been widely used as building blocks in the development of ordered structures to generate macrocycles, cages, calixarene systems, or two- and three-dimensional networks. − Boroxines are anhydrides of organoboronic acids and contain a heterocyclic B 3 O 3 ring and have been also successfully applied as building blocks for macrocycles, molecular cages, polymers, and three-dimensional networks, − with applications in methane storage, electronic , and optical devices, and as a source of aryl and vinyl groups. , Additionally, they can easily form supramolecular systems due to their ability to generate N→B coordinative bonds with organic amines . Although the boroxine B 3 O 3 ring is theoretically capable of coordinating up to three nitrogen atoms, it is well-known that the most stable adducts involve the interaction with only one nitrogen atom per ring, − as reflected in the number of structures reported with this stoichiometric composition. − In contrast, triarylboroxine species carrying aryl rings with amine substituents in the ortho position represent the few examples, in which a B 3 O 3 ring is coordinated to more than one nitrogen atom. − The number of 1:2 boroxine/amine adducts is limited and 1:3 adducts with independent organic amines are currently unknown. − With the interest in organoboron compounds and their applications in supramolecular chemistry taken into account, the study of the susceptibility of these assemblies toward the properties of the solvent is relevant, mainly because the lability of the N→B bond in the corresponding adducts is well-known …”

Synthesis, Crystal Structure and Hydrogen Bond Properties of {[HNC5H4B(OH)(OCH3)- 4]2PdCl2} New Compound

“…Aromatik N-oksitler ve türevleri, metal içeren bileşik oluşturabilen önemli köprüleme ligandlarıdır ( Aakeröy ve Salmon, 2005;Hall, 2011;Hezil, 2016). Bu nedenle pridin ligandları ile elde edilen ML2X2 tipi bileşiklerin kristal yapı özellikleri literatürde incelenmiştir (Yahsi ve ark., 2015;Gungor, 2017).…”

Synthesis and Structural Features of Hydrogen-Bonded Networks Based on The Combination of Tectons Triphenylboroxine Cation and Pt(SCN)4 Anion Salts

“…Due to these properties, they have attracted great attention and gain importance in supramolecular chemistry Hall, 2011). At the same time, boronic acids are important compounds in the definition of molecules and anions in material science and crystal engineering (Braga et al, 2003;Deplano et al, 2004;Aakeröy and Salmon, 2005;Marinaro et al, 2012;Hezil, 2016). Boronic acid compounds are promising buildingblocks in crystal engineering, mostly due to the formation of hydrogen bonds that seems to be the main force in producing supramolecular species in the solid phase ( Hall, 2011;Campos-Gaxiola et al, 2017).…”