Crystal structures and optical properties of 1-D iodoplumbates templated by in situ synthesized p-phenylenediamine derivatives

Two inorganic-organic hybrids, (MPDA)(2n)(Pb(3)I(10))(n) (MPDA=p-Me(3)NC(6)H(4)NMe(3)) (1) and (H(2)EPDA)(n)(Pb(2)l(6))(n)center dot 2nH(2)O (H(2)EPDA=p-Et(2)NHC(6)H(4)NHEt(2)) (2), have been solvothermally synthesized using p-phenylenediamine (PDA) as a precursor. Their iodoplumbate ions all show 1-D chain structures, but differ in interlinkage modes of [PbI(6)] octahedra: the former is both face- and edge-sharing, while the latter is face-sharing. The chain-like structure in 1 was reported only once in the literature. The results of optical absorption spectra and theoretical calculations for compounds PbI(2) and 1-2 reveal a quantum confinement effect. Photoluminescent analyses show that they all exhibit blue emissions upon UV irradiation, which mainly originate from charge transfer from iodine atoms to ammoniums. (C) 2011 Elsevier B.V. All rights reserved.