A One-dimensional Transition Metal Complex Constructed from 24-Membered Hinge-shaped Macrocycles with Salicylic Acid and 1,3-Bis(4-pyridyl)propane

A new 1-D coordination polymer [Cd(Hsal)2(bpp)2] 1 was hydrothermally synthesi- zed by self-assembly of the corresponding metal oxide and salicylic acid (H2sal) with exo-bidentate flexible dipyridyl ligand 1,3-bis(4-pyridyl)propane (bpp). X-ray crystal structure analysis reveals that complex 1 crystallizes in monoclinic,space group C2/c with a = 18.942(3),b = 12.9309(19),c = 16.504(2) ,β = 120.072(2)°,V = 3498.3(9)3,Z = 4,C40H38CdN4O6,Mr = 783.14,Dc = 1.487 g/cm3,μ = 0.679 mm-1,F(000) = 1608,R = 0.0619 and wR = 0.1435 for 3153 observed reflections (I > 2σ(I)). The most remarkable feature of 1 lies in the 1-D chain by repeating [Cd2(bpp)2] units which consist of a 24-membered macrocyclic ring. The 1-D motifs are further connected by C–H···O hydrogen bonds to generate a 2-D structure. In addition,thermal stability and luminescent property of compound 1 were also documented.