title: Near-infrared luminescent PMMA-supported metallopolymers based on Zn-Nd Schiff-base complexes.
abstract: On the basis of self-assembly from the divinylphenyl-modified Salen-type Schiff-base ligands H2L(1) (N,N'-bis(5-(3'-vinylphenyl)-3-methoxy-salicylidene)ethylene-1,2-diamine) or H2L(2) (N,N'-bis(5-(3'-vinylphenyl)-3-methoxy-salicylidene)phenylene-1,2-diamine) with Zn(OAc)2·2H2O and Ln(NO3)3·6H2O in the presence of pyridine (Py), two series of heterobinuclear Zn-Ln complexes [Zn(L(n))(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(n))(Py)Ln(NO3)3] and Wolf Type II Zn(2+)-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 Nd(3+)-centered emissions for both PMMA/[Zn(L(n))(Py)Nd(NO3)3] and Poly(MMA-co-[Zn(L(n))(Py)Nd(NO3)3]), where ethylene-linked hybrid materials endow relatively higher intrinsic quantum yields due to the sensitization from both (1)LC and (3)LC of the chromorphore than those from only (1)LC in phenylene-linked hybrid materials, and the concentration self-quenching of Nd(3+)-based NIR luminescence could be effectively prevented for the copolymerized hybrid materials in comparison with the doped hybrid materials.
authors.affiliation: School of Chemical Engineering, Shaanxi Key Laboratory of Degradable Medical Material, Northwest University , Xi'an 710069, Shaanxi China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Zhang
authors.forename: Weixu
authors.initials: W
authors.lastname: Feng
authors.forename: Peiyang
authors.initials: P
authors.lastname: Su
authors.forename: Xingqiang
authors.initials: X
authors.lastname: Lü
authors.forename: Jirong
authors.initials: J
authors.lastname: Song
authors.forename: Daidi
authors.initials: D
authors.lastname: Fan
authors.forename: Wai-Kwok
authors.initials: WK
authors.lastname: Wong
authors.forename: Richard A
authors.initials: RA
authors.lastname: Jones
authors.forename: Chengyong
authors.initials: C
authors.lastname: Su