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 language | English |
|---|---|
| Pages (from-to) | 3541-3548 |
| Number of pages | 8 |
| Journal | Inorganica Chimica Acta |
| Volume | 357 |
| Issue number | 12 |
| DOIs | |
| State | Published - 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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