| 摘 要： | A new 3D coordination polymer,namely,Yb_3(μ_3-OH)_3(μ_2-OH)(DDLA)_(2.5)(BIPY)](1,H_2DDLA = 2,2-dipyridyl-4,4-dicarboxylic acid,BIPY = 2,2?-bipyridine),has been synthesized via solvothermal method. The complex crystallizes in triclinic,space group P1 with a = 7.7339(4),b = 15.6699(8),c = 17.2221(9) ?,α = 68.8630(10),β = 88.1890(10),γ = 88.1740(10)°,V = 1945.27(17) ?~3,Z = 2,D_c = 2.296 g·cm~3,μ(MoKα) = 1.075 mm~(-1),F(000) = 1268,S = 1.068,R = 0.0263 and wR = 1.067 for 5176 observed reflections with I 2σ(I). Compound 1 contains a unique alternating double trinucleate {Yb_3(μ_3-OH)_2OH]_2}_n chain,in which Yb~(3+) is bridged through μ_3-OH and μ_2-OH two coordination modes. The alternating double trinucleate chains are further extended into a 3D structure through DDLA~(2-) ligands by different coordination modes. The photoluminescence spectra show 1 is highly sensitized by the characteristic emission of Yb~(3+) in the NIR region.
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