
%0 Journal Article
%A Harrowfield, Jack M. 
%A Sharma, Raj Pal 
%A Skelton, Brian W. 
%A White, Allan H. 
%T Structural Systematics of 2/4-Nitrophenoxide Complexes of Closed-Shell Metal Ions. V 2-Nitrophenoxides of Group 2
%J Australian Journal of Chemistry
%D 1998/08/18
%V 51
%N 8
%P 761-774
%K 
%R https://doi.org/10.1071/C97102
%U https://www.publish.csiro.au/paper/C97102 
%X Room-temperature single-crystal X-ray studies are recorded for 2-nitrophenoxide salts of Group 2 metals, variously hydrated M(2-np)2.xH2O, M = Mg, Ca, Sr; the structure of the barium analogue has been previously recorded. Mg(2-np)2.2H2O is monoclinic, P21/a, a 7&#183;377(1), b 7&#183;518(1), c 12&#183;877(3) &#197;, &#946; 106&#183;58(2)&#176;, Z = 2; conventional R on &#124;F&#124; 0&#183;13 for No 508 independent &#8216;observed&#8217; (I &#62; 3&#963;(I)) reflections. Ca(2-np)2.H2O is monoclinic, C2, a 25&#183;92(1), b 7&#183;176(3), c 3&#183;660(4) &#197;, &#946; 93&#183;66(5)&#176;, Z = 2, R 0&#183;061 for No 541. M(2-np)2.4H2O, M = Ca, Sr, are isomorphous, monoclinic, C2/c, a &#x2248; 31&#183;3, b &#x2248; 8&#183;1, c &#x2248; 12&#183;8 &#197;, &#946; 103&#176;, Z = 8; R was 0&#183;056, 0&#183;055 forNo 1988, 1744 respectively. The magnesium salt is a discrete molecular array disposed about a crystallographic inversion centre with chelating phenoxide ligands: trans-&#91;Mg(2-np)2(OH2)2&#93;. The calcium monohydrate salt is a novel one-dimensional polymer with a ... Ca(&#181;-O)2Ca(&#181;-O)2Ca ... spine, the ligand pairs chelating the calcium with phenoxide-O additionally bridging. The seven-coordinate calcium atoms lie on the crystallographic 2 axis with the water molecule, also on that axis, making up a seven-coordinate environment. The tetrahydrate is also a one-dimensional polymer with a similar spine, the bridging oxygen atoms derivative of water molecules. A chelating ligand and two further water molecules make up an eight-coordinate metal environment, with the free anions interleaving stacks of coordinated anions up c. 
