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Crystal structures and third-order NLO properties in DMF solution of Co(II)-bpfp coordination polymers (bpfp = N,N′-bis(pyridylformyl) piperazine)

  • Hong Xu
  • , Yinglin Song
  • , Hongwei Hou*
  • *Corresponding author for this work
  • Zhengzhou University

Research output: Contribution to journalArticlepeer-review

Abstract

Two novel Co(ii) coordination polymers {[Co(H2O) 2(CH3OH)2(4-bpfp)](NO3) 2}n 1 (4-bpfp=n,n-bis(4-pyridylformyl) piperazine) and [Co(NCS)2(CH3OH)2(3-bpfp)] n 2 (3-bpfp=N,N-bis(3-pyridylformyl)piperazine) have been synthesized and characterized by single crystal X-ray diffraction. Both the polymers consist of one-dimensional chains constructed by bridging bpfp ligands and Co(II) ions. The existence of O⋯H-O hydrogen bond in 1 and S⋯H-O hydrogen bond in 2 play important roles in creating interesting supramolecular structures. Their third-order nonlinear optical (NLO) properties in DMF solution have been studied by Z-scan technique. The results reveal that polymers 1 and 2 exhibit strong NLO absorption effects (α2=9. 00×10-11 m W-1 for 1; 1.41×10-10 m W-1 for 2) and self-focusing performance (n2=3. 24×10-16 esu for 1; 3.05×10-16 esu for 2) in DMF solutions. The corresponding effective NLO susceptibilities χ(3) values are 3.08×10-12 esu (1) and 4.70×10-12 esu (2). All of the values are comparable to those of the reported good NLO materials. Additionally, the TG-DTA results of the two polymers are in agreement with the crystal structures.

Original languageEnglish
Pages (from-to)3541-3548
Number of pages8
JournalInorganica Chimica Acta
Volume357
Issue number12
DOIs
StatePublished - 10 Sep 2004

Keywords

  • Co(ii) coordination polymer
  • Crystal structure
  • Synthesis
  • Thermal response
  • Third-order nlo properties
  • n,n- bis(pyridylformyl)piperazine metal complexes

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