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   <subfield code="a">Persistence of layer motifs in the crystal structures of [1,4-bis-(2-methoxy-2-carbonylethyl)piperazinium (2')] chloride and [1,4-bis-(2-amidoethyl)piperazinium (2')] perchlorate</subfield>
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   <subfield code="a">: Two structures of the closely related piperazinium salts, [1,4-bis-(2-methoxy-2-carbonylethyl)piperazinium (2+)] chloride (1) and [1,4-bis-(2-amidoethyl)piperazinium (2+)] perchlorate (2) reveal the persistence of a layer structure, interspersed with anions, held in place by N-H···Cl, C-H···O and C-H···Cl interactions in the case of 1, and N-H···O and C-H···O interactions in the case of 2. Compound 1 crystallizes in the triclinic space group P-1 with a=6.7667(6) Å, b=6.9467(6) Å, c=9.3880(18) Å, α=105.845(9)°, β=99.896(16)°, γ=103.600(9)°, and Z=1. Compound 2 crystallizes in the monoclinic space group P21/c with a=9.0930(8) Å, b=10.0525(11) Å c=10.2104(13) Å, β=114.279(9)°, and Z=2.</subfield>
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