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

Crystals of the first new organo-inorganic hybrid borate based on potassium crown ether complex, [K(C12H24O6)B5O6(OH)(4)](H2O) (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) & Aring;, b = 11.6289(3) & Aring;, c = 21.2247(6) & Aring;, V = 2509.76(12) & Aring;(3), R-obs = 0.059. The structure of 1 consists of molecular [K(C12H24O6)B5O6(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.