Lithium and rubidium hydrogen monofluoroacetates, M[H(CH2FCOO)(2)]: Synthesis, crystal structure, and hydrogen bondingстатья
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Аннотация:Acid salts of monofluoroacetic acid, M[H(CH2FCOO)(2)] (M = Li+, Rb+), were synthesized and studied by X-ray diffraction analysis. Lithium hydrogen monofluoroacetate crystallizes in the monoclinic system, space group P2(1)/c, Z= 4, a = 9.931(2), b = 7.970(2), c = 8.367(2) Angstrom, beta = 90.59(2)Angstrom; rubidium hydrogen monofluoroacetate (II) crystallizes in the monoclinic system, space group P2(1)/n, Z = 4, a = 12.022(3), b = 4,908(1), c = 12.875(3) Angstrom, beta = 104.95(2)degrees. The asymmetric hydrogen bond [O-H ... O 2.517(2) Angstrom], combines the monofluoroacetate anion and monofluoroacetic acid molecule in I into dimers, The coordination environment of lithium (LiO4F) is a distorted tetragonal pyramid, with the oxygen atom occupying its axial vertex. In structure II, the complexed centrosymmetric dimeric anions [H(CH2FCOO)(2)](-) are formed due to the symmetric hydrogen bonds O ... H ... O, 2.453(8)and 2.463(8) Angstrom. The results obtained for I and II are compared with the literature data oa alkali-metal hydrogen (including halogen-substituted) acetates.