
TY  - JOUR
A1  - Harrowfield, JM 
A1  - Miyamae, H 
A1  - Shand, TM 
A1  - Skelton, BW 
A1  - Soudi, AA 
A1  - White, AH 
T1  - Lewis-Base Adducts of Lead(II) Compounds. VIII. Synthetic and Structural Studies of Some Adducts of Linear Polyamines With Lead(II) Bromide
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1996
VL  - 49
IS  - 10
SP  - 1043
EP  - 1050
KW  - 
UR  - https://doi.org/10.1071/CH9961043 
N2  - Syntheses and room-temperature single-crystal X-ray structure determinations are recorded for adducts of lead(II) bromide with some linear polyamines. Adducts with ethane-1,2-diamine ('en') and propane- 1,2-diamine (' pn ') are of 2:1 and 1:1 stoichiometry respectively. [(en)2PbBr2](&#8734;|&#8734;) is monoclinic, C2/c, a 13,076(4), b 7.586(2),c 13.248(4) &#506;, &#946; 117.88(2)&#176;, Z = 4 f.u .; R was 0.029 for No = 1832 'observed' (I > 3&#963;(I)) reflections (a redetermination ). [( pn )PbBr2](&#8734;|&#8734;) is orthorhombic, Pbca , a 23.457(3), b 9.567(2), c 7.714(3) &#506;, Z = 8; R 0.051 for No 1297. [(en)2PbBr2](&#8734;|&#8734;) is a single stranded linear polymer parallel to c; the lead atom, lying on a crystallographic twofold axis, is six-coordinate PbN4Br2, with the bromine atoms cis in the coordination sphere and lying opposed to a bidentate en ligand. The trans sites are linked into a chain by bridging en ligands . [( pn )PbBr2](&#8734;|&#8734;) is a more complex two-dimensional polymer; the pn is bidentate , but the lead atoms are now eight coordinate with doubly and quadruply bridging bromines linking them into the polymeric sheet. The adduct with '323tet' (4,7-diazadecane 1,10-diamine) is of a novel (323tet)2(PbBr2)3 stoichiometry , best represented (simplistically) as {[ Pb (323tet)]2[PbBr6]}(&#8734;|&#8734;); crystals are triclinic, P&#299; , a 11.892(4), b 9.306(3), c 9.016(6) &#506;, &#945; 60.74(4), &#946; 86.04(4), &#947; 74.43(3)&#176;, Z = 1 f.u ., with R 0.061 for No 2071. About one lead atom type, the ligand is quadridentate , lying on one face of the coordination sphere; the region opposite is occupied by four triply bridging bromine atoms from the [PbBr6] anionic units (which contain quasi-octahedral, centrosymmetric lead. with a pair of trans-bromine atoms terminal and the others bridging) linking the array into a two dimensional polymer. 
ER  -

