
%0 Journal Article
%A Harrowfield, JM 
%A Kepert, DL 
%A Miyamae, H 
%A Skelton, BW 
%A Soudi, AA 
%A White, AH 
%T Lewis-Base Adducts of Lead(II) Compounds. XVIII. Synthetic and Structural Studies of Some 1:1 and 2:1 Adducts of 2,4,6-Tris (2-pyridyl)-1,3,5-triazine With Lead(II) Nitrate
%J Australian Journal of Chemistry
%D 1996/10/01
%V 49
%N 10
%P 1147-1155
%K 
%R https://doi.org/10.1071/CH9961147
%U https://www.publish.csiro.au/paper/CH9961147 
%X Adducts of lead(II) nitrate with 2,4,6-tris(2-pyridyl)-1,3,5-triazine (' trz ') have been synthesized and structurally characterized by room-temperature single-crystal X-ray studies, for 1:1 and 1:2 stoichiometry. Crystals of [( trz ) Pb (NO3)2](&#8734;|&#8734;) are monoclinic, P 21/c, a 10.531 (1), b 12.856(2), c 16.874(3) &#506;, &#946; 102.83(1)&#176;, Z = 4 f.u .; R was 0.027 for No = 2773 'observed' (I > 3&#963;(I)) reflections. The complex is an infinite polymer; the plane of the tridentate trz ligand lies normal to the polymer axis ( Pb -N(central; distal) 2.523(5); 2.594(5), 2.568(5) &#506;) with unsymmetrically bidentate nitrate groups to either side ( Pb -O 2.598(6), 2.928(7); 2.556(6), 2.911(7) &#506;). The third oxygen of each nitrate group bridges to the next lead atom in the polymer chain ( Pb -O 3.008(5), 3.083(6)&#506;). [( trz )2Pb(NO3)2] is monoclinic, C 2/c, a 15.723(5), b 10.034(2), c 24.379(15) &#506;, &#946; 106.84(4)&#176;, Z = 4 f.u .; R was 0.038 for No 3030. The compound is a methanol monosolvate. The complex species is mononuclear, with the lead atom located on a crystallographic 2 axis and 10-coordinated by pairs of symmetry-related tridentate trz ( Pb -N(central; distal) 2.779(4); 2.800(5), 2.818(5) &#506;) and bidentate nitrate ligands ( Pb -O 2.796(6), 2.689(5)&#506;). A hexahydrate has also been obtained (triclinic, P&#299; a 23.580(9), b 10.147(4), c 9.762(4)&#506;, &#945; 113.14(3), &#946; 92.11(3), &#947; 101.60(3)&#176;, Z = 2 f.u ; R 0.041 for No 5633); although metal-ligand distances are similar to those found in the methanol solvate, and quasi-2 symmetry is retained, a very different stereochemistry is evident in respect of the relative dispositions of the ligands about the (quasi)-2 axis, involving a substantial twist of the two nitrate ligands relative to the triazines, and a flattening of the latter. The coordination polyhedron is different in the two 1:2 adducts. In the methanol solvate the stereochemistry is pentagonal antiprismatic whereas in the hexahydrate it is bicapped square antiprismatic. 
