Near-Infrared Luminescent PMMA-Supported Metallopolymers Based on Zn-Nd Schiff-Base Complexes

On the basis of self-assembly from the divinylphenyl-modified Salen-type Schiff-base ligands H2L1 (N,N'-bis(5-(3'-vinylphenyl)-3-methoxy-salicylidene)ethylene-1,2-diamine) or H2L2 (N,N'-bis(5-(3'-vinylphenyl)-3-methoxy-salicylidene)phenylene-1,2-diamine) with Zn(OAc)(2)center dot 2H(2)O and Ln(NO3)(3 center dot)6H(2)O in the presence of pyridine (Py), two series of heterobinuclear Zn-Ln complexes [Zn(L")(Py)Ln(NO3)(3)] (n = 1, Ln = La, 1; Ln = Nd, 2; or Ln = Gd, 3 and n = 2, Ln = La, 4; Ln = Nd, 5; or Ln = Gd, 6) are obtained, respectively. Further, through the physical doping and the controlled copolymerization with methyl methacrylate (MMA), two kinds of PMMA-supported hybrid materials, doped PMMA/[Zn(L")(Py)Ln(NO3)(3)] and Wolf Type 11 Zn2+-Ln(3+)-containing metallopolymers Poly(MMA-co-[Zn(L-n)(Py)Ln(NO3)(3)], are obtained, respectively. The result of their solid photophysical properties shows the strong and characteristic near-infrared (NIR) luminescent Nd3+-centered emissions for both PMMA/[Zn(L-n)(Py)Nd(NO3)(3)] Poly(MMA-co-[Zn(L-n)(Py)Nd(NO3)(3)]) and where ethylene-linked hybrid materials endow relatively higher intrinsic quantum yields due to the sensitization from both (LC)-L-1 and (LC)-L-3 of the chromorphore than those from only (LC)-L-1 in phenylene-linked hybrid materials, and the concentration self-quenching of Nd3+-based NIR luminescence could be effectively prevented for the copolymerized hybrid materials in comparison with the doped hybrid materials.