Iodoplumbates with tetra- and penta-coordinated Pb2+ ions

In contrast to all known iodoplumbates with octahedrally coordinated Pb2+ i ons, square pyramidal geometry is observed in the iodoplumbate chains of (P r4N)[PbI3] (1) and [Mg(dmf)(6)][PbI3](2) (2), whereas the isolated anions i n (Ph4P)(2) [Pb2I6] (3) and [Bu3N-(CH2)(3)-NBu3] [PbI4] (4) contain tetra-c oordinated lead atoms. (pr(4)N)[pbI(3)] (1): a = 910.86(6), b = 1221.46(7), c = 1907.7(1) pm, V = 2122.5(2) 10(6) pm(3), space group P2(1)2(1)2(1); [M g(dmf)(6)][PbI3](2) (2): a = 891.24(9), b = 1025.34(7), c = 1234.82(9) pm, a = 92.938(8), beta = 106.457(8), gamma = 98.100(7)degrees, V = 1066.4(2).1 0(6) pm(3), space group P (1) over bar; (Ph4P)(2)[Pb2I6] (3): a = 1174.5(1) , b = 722.29(7), c = 3104.8(4) pm, beta = 100.50(1)degrees V = 2589.8(5).10 (6) pm(3), space group P2(1)/n; [Bu3N-(CH2)(3)-NBu3][PbI4] (4): a = 2178.3( 1), b = 1008.63(5), c =1888.3(l) pm, beta =110.003(5)degrees, V = 3898.6(4) .10(6) pm(3), space group P2/c.