Near-infrared (NIR) luminescent metallopolymers based on Ln4(Salen)4 nanoclusters (Ln = Nd or Yb)

Weixu Feng; Yao Zhang; Zhao Zhang; Peiyang Su; Xingqiang Lü; Jirong Song; Daidi Fan; Wai-Kwok Wong; Richard A. Jones; Chengyong Su

doi:10.1039/C3TC31814A

Near-infrared (NIR) luminescent metallopolymers based on Ln₄(Salen)₄ nanoclusters (Ln = Nd or Yb)†

Weixu Feng,^a Yao Zhang,^a Zhao Zhang,^a Peiyang Su,^a Xingqiang Lü,*^a Jirong Song,^a Daidi Fan,^a Wai-Kwok Wong,^b Richard A. Jones^c and Chengyong Su^d

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* Corresponding authors

^a Shaanxi Key Laboratory of Degradable Medical Material, Shaanxi Key Laboratory of Physico-inorganic Chemistry, Northwest University, Xi'an 710069, Shaanxi, China
E-mail: lvxq@nwu.edu.cn
Tel: +86-29-88302312

^b Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, China

^c Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, TX 78712-0165, USA

^d MOE Laboratory of Bioinorganic and Synthetic Chemistry/KLGH EI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China

Abstract

A series of novel Wolf Type II Ln³⁺-containing metallopolymers PNBE-co-Ln₄(Salen)₄ (Ln = La, Nd, Yb, Er or Gd) are obtained from the controlled ring-opening metathesis polymerization (ROMP) of norbornene (NBE) and the homoleptic tetranuclear [Ln₄(L)₂(HL)₂Cl₂(μ₃-OH)₂]·2Cl (Ln₄(Salen)₄, Ln = La, 1; Nd, 2; Ln = Yb, 3; Ln = Er, 4; Ln = Gd, 5) self-assembled from the diallyl-modified flexible hexadentate Salen-type Schiff-base ligand H₂L (N,N′-bis(5-allyl-3-methoxysalicylidene)cyclohexane-1,2-diamine) with LnCl₃·6H₂O. The results of their photophysical properties show that the strong and characteristic near-infrared (NIR) luminescent Ln³⁺-centered emissions for PNBE-co-Ln₄(Salen)₄ (Ln = Nd, 2; Yb, 3) are retained with relatively higher intrinsic quantum yields than the corresponding monomers in solution, and the concentration self-quenching of Ln³⁺-based materials could be effectively prevented in both solution and solid states.

Journal of Materials Chemistry C

Near-infrared (NIR) luminescent metallopolymers based on Ln₄(Salen)₄ nanoclusters (Ln = Nd or Yb)†

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Near-infrared (NIR) luminescent metallopolymers based on Ln₄(Salen)₄ nanoclusters (Ln = Nd or Yb)

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Journal of Materials Chemistry C