An Additional Structural and Electrical Study of Polymeric Haloplumbates(II) with Heterocyclic Diprotonated Amines

The crystal structures of three polymeric bidimensional piperazinium, N,N¢-dimethylpiperazinium, and Nbenzylpiperazinium hydrate haloplumbates(II) and one polymeric monodimensional N,N¢-dimethylpiperazinium hydrate haloplumbate(II) were determined by means of X-ray analysis. The (pipzH2)[PbCl4] salt is monoclinic, space group P21/c, with a ) 5.778(2) Å, b ) 22.612(26) Å, c ) 9.061(4) Å, â ) 95.37(6)°, Z ) 4; (me2pipzH2)- [PbBr4] crystallizes in the monoclinic P21 space group with a ) 6.101(3) Å, b ) 18.822(12) Å, c ) 6.229(2) Å, â ) 98.62(4)°, Z ) 2; the crystals of (me2pipzH2)2[Pb3I10]â4H2O are monoclinic, space group P21/c, a ) 19.054- (4) Å, b ) 12.239(3) Å, c ) 18.273(4) Å, â ) 93.42(12)°, Z ) 4; (benzpipzH2)3[Pb2Br10]â2H2O crystallizes in the monoclinic P21/c space group with a ) 22.380(22) Å, b ) 9.304(15) Å, c ) 24.577(25) Å, â ) 94.28(11)°, Z ) 2. Different model type structures, such as one-dimensional linear chain, ribbonlike, and perovskite-like, were observed, and factors governing these structural arrangements are pointed out. The compounds were also investigated by means of thermal and electrical measurements, and correlations between electrical properties and crystal structures were noted.