Crystal and molecular structure and ion selective and complexing properties of 1,5-Bis[2-(dioxyphosphoryl-4-methoxy)phenoxy]-3-oxapentane dihydrate [(OH)2 (O)P(C6H3OCH3)(OCH 2CH2)2 O(C6H4OCH 3)P(O)(OH) 2]·2H2O

Ion selective and complexing properties of 1,5-bis[2-(dioxyphosphoryl-4-methoxy)phenoxy]-3-oxapentane dihydrate H4M2 · 2H2O (I) were described. X-ray diffraction analysis for compound I was performed. The crystals are orthorhombic, a = 7.9818(16) Å, b = 30.553(6) Å, c = 9.0559(17) Å, V = 2208.5(8) Å3, Z = 4, space group Pnma, R = 0.0500 over 1372 reflections with I > 2σ(I). In I, the H4M2 molecules are combined by hydrogen bonds (HB) with two crystallographically independent H2O(7) and H2O(8) molecules to give neutral H4M2 · 2H2O aggregates. The HB between the phosphoryl and hydroxyl oxygen atoms of the aggregates and the donor O(7)-H…O(8) HB give rise to a layered structure. Conclusions about the Cu(H2M2) compound structure were drawn based on the X-ray diffraction, DTA, and vibrational spectroscopy data.