Sodium and Potassium tert-Butyl Peroxide Hydrates: Crystal Structure and Properties

Sodium and potassium tert-butyl peroxide hydrates 2Na⁺·2C₄H₉$${\text{O}}_{2}^{ - }$$·7H₂O (I) and 2K⁺· 2C₄H₉$${\text{O}}_{2}^{ - }$$·4H₂O (II) were prepared. According to X-ray diffraction data (CIF files CCDC no. 2081025 (I) and no. 2081024 (II)), the compounds are coordination polymers in which alkali metal atoms have C.N.(Na) of 6 or C.N.(K) of 6 and 8. The crystal packings comprise layers with clearly defined hydrophobic surfaces consisting of hydrocarbon groups and hydrophilic inner areas including water molecules, alkali metal cations, and peroxy groups of the tert-butyl peroxide anions. Compounds were characterized by vibrational spectroscopy, ¹H, ¹³C NMR spectroscopy, thermogravimetry, and differential scanning calorimetry.