
%0 Journal Article
%A Kepert, DL 
%A Skelton, BW 
%A Waters, AF 
%A White, AH 
%T Synthesis and Structural Systematics of Nitrogen Base Adducts of Group 2 Salts. III. Some Mixed-Ligand Complexes With Pyridine Base and Oxygen Donors
%J Australian Journal of Chemistry
%D 1996/01/01
%V 49
%N 1
%P 47-59
%K 
%R https://doi.org/10.1071/CH9960047
%U https://www.publish.csiro.au/paper/CH9960047 
%X In association with the report of a number of homoleptic pyridine base adducts of Group 2 salts in the preceding paper, a number of mixed-ligand compounds have been synthesized and characterized by room-temperature single-crystal X-ray studies. MgI2.2H2O.6py &#8801; [trans-( py )4Mg(OH2)2]I2.2py (1) is monoclinic, P21/c, a 10.47(1), b 10.0400(8), c 32.77(1) &#506;, &#946; 92.34(6)&#176;, Z = 4; R was 0.053 for No = 2990 independent, observed (I > 3&#963;(I)) diffractometer reflections. Mg-O are 2.063(8) and 2.061(8), Mg-N ranging between 2.19(1) and 2.23(1) &#506;. MgI2.4H2O.8(3,5-dmpy)&#8801;[trans-(3,5-dmpy)2Mg(OH2)4]I2.6(3,5-dmpy) (2) is orthorhombic, Pcab , a 22.203(6), b 17.023(8), c 16.548(7) &#506;, Z = 4 f.u .; R 0.045 for N o 2457. Mg-O are 2.026(5) and 2.082(5), and Mg-N 2.267(6) &#506; in the centrosymmetric cation, with which the aggregate of anions and solvent form a discrete hydrogen-bonded cluster. CaBr2.2H2O.4(2-mpy) &#8801; [trans-CaBr2(OH2).2(2-mpy)2].2(2-mpy) (3) is monoclinic, P 21/c, a 7.076(1), b 9.329(3), c 21.957(2) &#506;, &#946; 98.34(1)&#176;, Z = 2 f.u .; R 0.076 for No 1599; Ca-Br, N, O are 2.840(1), 2.56(1), 2.355(6) &#506; respectively; its 3-mpy counterpart (4) has a very similar cell but with b and c transposed; R was 0.047 for No 2116, and Ca-Br, N, O 2.8902(6), 2.500(5), 2.344(3) &#506;. Sr (ClO4)2.3py.dmf &#8801; [ Sr (O2ClO2)2( py )3(O- dmf )] (5) is monoclinic, P21, a 8.814(2), b 16.985(7), c 9.499(1) &#506;, &#946; 114.97(1)&#176;, Z = 2; R 0.047 for No 1717. The strontium is eight-coordinate: Sr -O(ClO4) are 2.644(8)-2.69(1), Sr-N 2.64(1)-2.69(1), Sr -O( dmf ) 2.417(9) &#506;. The other two compounds, Ba (ClO4)2.H2O.L (L = py (6), 3-mpy (7)), are two-dimensional polymers, linked by bridging perchlorate ions and water molecules. Compound (6) is orthorhombic, Pnna , a 24.098(3), b 10.444(1), c 4.871(3) &#506;, Z = 4 f.u ., R 0.025 for N o 688: the barium is 11-coordinate Ba (O(H2O))2(O(ClO4))8N with m symmetry, Ba -N 2.889(7), Ba-O(H2O)2.943(4), Ba-O(ClO4) 2.844(6)-2.942(5) &#506;. Compound (7) is monoclinic, P 21/c, a 7.421(4), b 24.479(8), c 7.293(7) &#506;, &#946; 104.80(6)&#176;, Z = 4 f.u ., R 0.041 for N o 2033; the barium is nine-coordinate Ba (O(H2O))2(O(ClO4))6N, Ba-N 2.839(7), Ba -O(H2O) 2.791(5), 3.049(5), Ba-O(ClO4) 2.753(6)-2.936(6) &#506;. 
