New Heptazine Based Materials with a Divalent Cation – Sr[H 2 C 6 N 7 O 3 ] 2 ·4H 2 O and Sr[HC 6 N 7 (NCN) 3 ]·7H 2 O
2012; Wiley; Volume: 639; Issue: 2 Linguagem: Inglês
10.1002/zaac.201200345
ISSN1521-3749
AutoresNicole E. Braml, Wolfgang Schnick,
Tópico(s)Synthesis and Characterization of Heterocyclic Compounds
ResumoAbstract The new heptazine based compounds Sr[H 2 C 6 N 7 O 3 ] 2 · 4H 2 O and Sr[HC 6 N 7 (NCN) 3 ] · 7H 2 O have been synthesized by metathesis reactions in aqueous solution. Crystal structures were studied by single‐crystal X‐ray diffraction and Rietveld refinement. Strontium cyamelurate tetrahydrate exhibits distorted zigzag strands embedding Sr 2+ ions surrounded by crystal water molecules ( Fdd 2, a = 1194.0(17), b = 6358.14(97), c = 602.73(89) pm, Z = 8, GOF = 1.034, R p = 0.033, wR p = 0.042, R B = 0.84). Strontium melonate heptahydrate crystallizes in a layer‐like structure characteristic for heptazine‐based compounds ( P $\bar{1}$ , a = 660.76(13), b = 1080.7(2), c = 1353.8(3) pm, α = 101.67(3), β = 101.40(3), γ = 94.60(3)°, Z = 2, R 1 = 0.032, wR 2 = 0.072). Additionally, the thermal behavior has been studied by DTA/TG measurements and FTIR spectroscopy data are presented.
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