Crown ether complexes as a possible template for hybrid organic–inorganic borates

Abstract Crystals of the first new organo–inorganic hybrid borate based on potassium crown ether complex, [K(C 12 H 24 O 6 )B 5 O 6 (OH) 4 ](H 2 O) ( 1 ), have been produced from aqueous solutions and characterized by single-crystal X-ray diffraction. 1 crystalizes is orthorhombic system, Pnma , a = 10.1684(3) Å, b = 11.6289(3) Å, c = 21.2247(6) Å, V = 2509.76(12) Å 3 , R obs = 0.059. The structure of 1 consists of molecular [K(C 12 H 24 O 6 )B 5 O 6 (OH) 4 ] 0 complexes, common for crown ether complexes but yet not among borates, with a very rare monodentate coordination of the common pentaborate anion(1-). The molecular complexes are linked into weak chains via hydrogen bonding to outer-sphere water molecules. Hirshfeld surfaces analysis and complexity measurement of 1 were performed. Perspectives of borate structures containing crown ether complexes as templates are briefly outlined.