| Popis: |
By reacting the K, Rb, Cs, or Tl carbonates with excess phosphoric acid, crystals of superacid phosphites, namely, (RbH2PO3)2· H3PO3(I), (TlH2PO3)2· H3PO3(II), KH2PO3· H3PO3(III), α-CsH2PO3· H3PO3(IV), and β-CsH2PO3· H3PO3(V), were synthesized. Their structures were determined by single-crystal X-ray diffraction analysis at 150 K. Crystals I: triclinic system, space group \(P\overline 1 \), a= 7.713(2) A, b= 8.679(3) A, c= 9.235(3) A, α = 79.36(3)°, β = 67.60(2)°, γ = 88.13(3)°, R1= 0.0252; crystals II: triclinic system, space group \(P\overline 1 \), a= 7.690(3) A, b= 8.494(3) A, c= 9.292(4) A, α = 79.48(3)°, β = 66.72(3)°, γ = 85.45(3)°, R1= 0.0485; crystals III: monoclinic system, space group P21/c, a= 8.726(3) A, b= 12.182(4) A, c= 6.354(2) A, β = 104.14(3)°, R1= 0.0241; crystals IV: orthorhombic system, space group P212121, a= 6.033(1) A, b= 6.444(1) A, c= 18.345(4) A, R1= 0.0172; crystals Vare monoclinic, space group C2/c, a= 9.990(3) A, b= 12.197(4) A, c= 6.866(2) A. β = 118.14(3)°, R1= 0.0181. The hydrogen bonding systems form corrugated bands (Iand II), bent layers (III), individual tubes with rectangular cross sections (V), or a three-dimensional framework (IV). A comparative analysis of the crystal structures of acid phosphites with different compositions was performed. |
Full text from SpringerLink