| Abstract: Two 1Dchain Hg(Ⅱ) coordination polymers {[Hg2I4(L1)2]·3DMF}n (1) and {[Hg2I4(L2)]·DMF}n (2) (where L1=3,5-bis(4-pyridyl)-1,2,4-triazole，L2=4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole) have been synthesized in DMFsolution with HgI2 and L1, L2, respectively. The polymers were characterized by elemental analysis, IRand X-ray single crystal diffraction analysis. Complex 1 crystallizes in the triclinic system, space group P1 with cell parameters a=0.8203(2) nm, b=1.6310(5) nm, c=1.8458(5) nm, α=69.026(3)°, β=88.521(4)°, γ=83.355(4)°, V=2.2901(11) nm3, Z=2, μ(Mo Kα)=9.439 mm-1, F(000)=1448, R1=0.0461, wR2=0.1331 [I>2σ(I)]. In the complex 1, each Hg(Ⅱ) ion atom locates in a distorted coordination tetrahedron and coordinates with two pyridine Natoms from two L1 ligands. The remaining two coordination sites of Hg(Ⅱ) ion are occupied by two Iions. Each L1 acts as a bridge to bond neighboring two Hg(Ⅱ) ions to form an infinite 1D chain. The 1Dchain is parallel to the bc plane. Complex 2 crystallizes in the monoclinic system, space group P21/c with cell parameters a=0.4330(3) nm, b=2.4657(15) nm, c=2.4592(16) nm, β=91.267(14)°, V=2.625(3) nm3, Z=4, μ(Mo Kα)=16.407 mm-1, F(000)= 2144, R1=0.0515, wR2=0.1140 [I>2σ(I)]. In the complex 1, each Hg(Ⅱ) ion atom locates in a distorted coor-dination tetrahedron and coordinates with one pyridine Natom from L2 ligand and the remaining three coordination sites of Hg(Ⅱ) ion are occupied by three crystallographically distinct Iions. Two Iions act as bridging ligands, which link the Hg(Ⅱ) centers forming a 1Dzig-zag-Hg-I-Hg-I-chain. The adjacent-Hg-I-Hg-I-chains are further connected by bidentate L2 ligand, resulting in a unique 1Ddouble chain. The double chain structure of 2 can be regarded as a ladder-like chain containing two chains-Hg-I-Hg-I-and L2 spacers. The ladder-like chain extends in the a direction. The experimental results show that the title complexes have good luminescent properties and could be used as potential optical materials. CCDC: 751327, 2; 991983, 2 |
