Comprehensive study of substituent effects on structure and photochromic properties of 1,3-benzoxazine-4-one spiropyrans

Structure–Properties Correlations in the Range of Cationic Spiropyrans as Analogues of Cyanine Dyes

“…The crystals of 3 a have shown the loosest packing (21.4 % of voids in the unit cell), while the crystals of 3 b were the densest ones (16.2 % of voids). For comparison, the previously studied non–photochromic crystals of 1,3‐benzoxazin‐4‐one series SPPs are characterized by a percentage of cavities in the range of 8.4–9.4 %, [46] and formyl–substituted SPPs of indoline series have slightly looser packing (10.8 and12.5 % of voids in the unit cell) [47] . This suggests that salt SPPs are indeed more loosely packed than many known neutral compounds of this class.…”

Construction of novel polybenzoxazine coating precursor exhibiting excellent anti-corrosion performance through monomer design

“…Because of their high degree of molecular design flexibility, BZs resins have a variety of mechanical and physical characteristics [ 12 ]. Owing to these intriguing properties, benzoxazine is an attractive risk for using inebriety of industrial applications, including electronics, aerospace, composites, and coating [ [11] , [12] , [13] , [14] ]. The primary approach to prevent the mild steel from undergoing detrimental corrosion during industrial processes is through the use of organic coatings that offer resistance to corrosion.…”

“…Affordable essential components, such as formaldehyde, primary amines, and phenolic compounds, may synthesize PBZs, which could then be polymerized through a ring-opening addition process without producing reaction byproducts [ 5 ]. Due to acid-base interactions and the formation of encapsulants, the amphoteric property of PBZs, both basic and acidic, enables a wide range of applications as adhesives for both acidic and basic surfaces [ [11] , [12] , [13] , [14] ]. MS was coated with silane-functional polybenzoxazine to resist corrosion [ 26 ].…”