title: Macrocyclic dinuclear, helical, layered and 3-D Ag(I) complexes constructed from AgX (X = NO3(-) and ClO4(-)) and flexible bis(pyridyl) ligands with a chelating spacer: syntheses, structures and photoluminescence properties.
abstract: Reaction of AgX (X = NO3− and ClO4−) and three flexible bis(pyridyl) ligands with a chelating spacer leads to the formation of eight novel Ag(I)-bis(pyridyl) coordination complexes: {[Ag2L1(NO3)2]n·2nH2O} (1), {[AgL1]n·nClO4} (2), {[AgL2]n·nNO3} (3), {[AgL2]n·nClO4} (4), [Ag2(H2L2)2]·6ClO4·9H2O (5), {[AgL3]n·nNO3·nH2O} (6), {[AgL3]n·nClO4·nH2O} (7), and {[Ag3(L3)2(ClO4)]n·2nClO4} (8) (L1 = N,N′-bis(pyridin-2-ylmethyl)propane-1,3-diamine, L2 = N,N′-bis(pyridin-3-ylmethyl)propane-1,3-diamine, L3 = N,N′-bis(pyridin-4-ylmethyl)propane-1,3-diamine), which have been characterized by elemental analysis, IR, TG, UV-Vis DRS, PL, powder and single-crystal X-ray diffraction. Complex 1 presents a (4,4) layered motif which is furnished by the bridging of L1 molecules and nitrate anions in μ4 (κ1N1:κ1N2:κ1N3:κ1N4) and μ2 (κ1O4:κ1O6) modes. With a different μ2 (κ1N1:κ1N2:κ1N3:κ1N4) mode, L1 molecules in complex 2 join the adjacent Ag(I) cations to form a helical chain structure. Complexes 3 and 4 also show helical chain structures with the L2 molecules displaying the same μ3 (κ1N1:κ1N2:κ1N3:κ1N4) mode. The protonation of –NH– groups in the chelating spacer leads to the formation of H2L22+ cations which further results in a macrocyclic dinuclear motif in complex 5. Complexes 6 and 7 are 3-D svi-x nets with the counter-anions and lattice water molecules being encapsulated in the 1-D channels. Complex 8 exhibits a snake-shaped chain with the L3 molecules presenting μ3 (κ1N:κ1N′:κ1N″:κ1N) mode. The structural diversities of complexes 1–8 can be attributed to the coordination modes and conformations of L1–L3. The photoluminescence properties demonstrate that complexes 1, 2 and 5 exhibit ligand-based blue emission maxima from 455 to 462 nm at room temperature in the solid state.
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, People's Republic of China. lhhuo68@yahoo.com shangao67@yahoo.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Huang
authors.forename: Zhao-Peng
authors.initials: ZP
authors.lastname: Deng
authors.forename: Ying-Hui
authors.initials: YH
authors.lastname: Xiao
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Huo
authors.forename: Shu-Nan
authors.initials: SN
authors.lastname: Zhao
authors.forename: Fa-Yuan
authors.initials: FY
authors.lastname: Ge
authors.forename: Shan
authors.initials: S
authors.lastname: Gao
mesh_terms: D015082:2,2'-Dipyridyl / Q000138:chemical synthesis / Q000737:chemistry*; D002614:Chelating Agents / Q000138:chemical synthesis / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D008024:Ligands; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D047028:Macrocyclic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D008958:Models, Molecular; D012834:Silver / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D056831:Coordination Complexes; D008024:Ligands; D049408:Luminescent Agents; D047028:Macrocyclic Compounds; D012834:Silver; D015082:2,2'-Dipyridyl