Polyrotaxane frameworks containing N,N′,N′′-(4,4′,4′′-nitrilotris(4,1-phenylene))triisonicotinamide: structural and luminescent properties?

CrystEngComm Pub Date: 2013-04-22 DOI: 10.1039/C3CE40558C

Abstract

The reaction of a C3-symmetric tridentate ligand, N,N′,N′′-(4,4′,4′′-nitrilotris(4,1-phenylene))triisonicotinamide (L), with various d10-metal salts of CuI, Cu(SCN), and M(ClO4)2 (M = Zn, Cd) led to four metal–organic materials of {[(Cu2I2)(L)2]·4DMF·2MeOH}n (1), {[Cu(L)2(NCS)2]·3DMF}n (2), and {[M(L)2(ClO4)2]·4EtOH}n (M = Zn 3 and Cd 4), respectively, which have been isolated and structurally characterized by X-ray diffraction studies. The X-ray analysis revealed that the interlocking of the 1-D double-zigzag chains of 1–4 into the macrocycles of the adjacent chains generates a novel 2-D (1-D → 2-D) polyrotaxane framework. In these 2-D polyrotaxane frameworks, the C3-symmetric tridentate ligand, L, only adopts a μ2-bridging mode, and the third arm is free. In addition, 1–4 are all emissive with dual emissions (431–452 and 558–570 nm) in the solid state at room temperature and at 77 K, which are suggested to be due to an intraligand transition of L based on the high similarities in emission energies to that of L.

Graphical abstract: Polyrotaxane frameworks containing N,N′,N′′-(4,4′,4′′-nitrilotris(4,1-phenylene))triisonicotinamide: structural and luminescent properties
Recommended Literature