TY - JOUR
T1 - Structural studies of some new lamellar magnesium, manganese and calcium phosphonates
AU - Cao, Guang
AU - Lee, Haiwon
AU - Lynch, Vincent M.
AU - Mallouk, Thomas E.
N1 - Funding Information:
We are grateful to Dr. Michael Schmerling, Department of Materials Science and Engineering, for carrying out the SEM experiments. This work was supported by grants from Research Corporation, the Texas Advanced Technology Research Program and the Robert A. Welch Foundation.
PY - 1988
Y1 - 1988
N2 - Layered phosphonate salts of divalent metal ions (Mg, Ca and Mn) are prepared by combining solutions of soluble metal salts and alkyl- or arylphosphonic acids. In this way the compounds Mg(O3PCnH2n+1)·H2O (n=1-12), Mg(O3PC6H5)·H2O, Mg(HO3PCH(C6H5)2) 2·8 H2O, Mn(O3PCH3)·H2O, Mn(O3PC6H5)·H2O, Ca(O3PCnH2n+1)·H2O (n≤5), Ca(HO3PC6H5)2 and Ca(HO3PCnH2n+1)2 (n≥6) were prepared. The M(O3PC6H5)·H2O compounds show good thermal stability, losing lattice water at 250-300°C without further decomposition below 550°C. Compounds derived from alkylphosphonic acids decompose at lower temperatures. The Mg(O3PCnH2n+1)·H2O series, Mg(O3PC6H5)·H2O, and Mn(O3PC6H5)·H2O group Pmn21; for the latter compound unit cell dimensions (Å) are a=5.733, b=14.298, c=4.931. The structure consists of roughly coplanar layers of metal atoms coordinated by phenylphosphonate groups above and below. Each metal atom is coordinated by five phosphonate oxygens and one lattice water molecule. Mg(O3PCnH2n+1·H2O adopts a similar structure; infrared spectra indicate all-trans alkyl chains. In Mg(HO3PCH(C6H5)2) 2·8 H2O, Mg(H2O) 2+6 ions and lattice water lie in hydrogen-bonded sheets; the benzhydryl groups lie above and below and make van-der-Waals contacts between layers.
AB - Layered phosphonate salts of divalent metal ions (Mg, Ca and Mn) are prepared by combining solutions of soluble metal salts and alkyl- or arylphosphonic acids. In this way the compounds Mg(O3PCnH2n+1)·H2O (n=1-12), Mg(O3PC6H5)·H2O, Mg(HO3PCH(C6H5)2) 2·8 H2O, Mn(O3PCH3)·H2O, Mn(O3PC6H5)·H2O, Ca(O3PCnH2n+1)·H2O (n≤5), Ca(HO3PC6H5)2 and Ca(HO3PCnH2n+1)2 (n≥6) were prepared. The M(O3PC6H5)·H2O compounds show good thermal stability, losing lattice water at 250-300°C without further decomposition below 550°C. Compounds derived from alkylphosphonic acids decompose at lower temperatures. The Mg(O3PCnH2n+1)·H2O series, Mg(O3PC6H5)·H2O, and Mn(O3PC6H5)·H2O group Pmn21; for the latter compound unit cell dimensions (Å) are a=5.733, b=14.298, c=4.931. The structure consists of roughly coplanar layers of metal atoms coordinated by phenylphosphonate groups above and below. Each metal atom is coordinated by five phosphonate oxygens and one lattice water molecule. Mg(O3PCnH2n+1·H2O adopts a similar structure; infrared spectra indicate all-trans alkyl chains. In Mg(HO3PCH(C6H5)2) 2·8 H2O, Mg(H2O) 2+6 ions and lattice water lie in hydrogen-bonded sheets; the benzhydryl groups lie above and below and make van-der-Waals contacts between layers.
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U2 - 10.1016/0167-2738(88)90016-1
DO - 10.1016/0167-2738(88)90016-1
M3 - Article
AN - SCOPUS:0023965117
SN - 0167-2738
VL - 26
SP - 63
EP - 69
JO - Solid State Ionics
JF - Solid State Ionics
IS - 2
ER -