A Series of Cr-III Coordination Supramolecules: Synthesis, Structure and Study of Surface Electron Behaviors

作者：Li, Lei; Niu, Shuyun^*; Shi, Zhongfeng; Wu, Hanqing; Zhu, Wenting; Jin, Jing; Chi, Yuxian; Xing, Yongheng

来源：Journal of Inorganic and Organometallic Polymers and Materials, 2011, 21(1): 15-24.

DOI：10.1007/s10904-010-9430-1

• Chromium complex
• Synthesis
• Structure
• Surface electron behavior

Three chromium(III) coordination supramolecules, [CrQ(2)(H2O)Cl]center dot H2O 1, [Cr(Pic)(2)(phen)]center dot NO3 center dot 2.5H(2)O 2, [Cr(ATA)(phen)]center dot CH3OH center dot 3H(2)O 3 (HQ = Quinoline 2-acid, HPic = Picolinic 2-acid, H(3)ATA = Ammonia triacetic acid, phen = 1,10-Phenanthroline), have been synthesized solvothermally and characterized by single-crystal X-ray diffraction, IR spectra, UV-Vis absorption spectra and elemental analysis. The surface electron behavior of chromium complexes have been studied emphatically by surface photovoltage spectroscopy (SPS). Structural analyses indicate that the three complexes are all molecular complexes with the ligands of carboxylate groups; and, they are further connected into supramolecules by hydrogen bonds and pi-pi interactions. The results of SPS show that there are positive photovoltage response bands within 300-800 nm, which indicate that they all possess obvious photoelectric conversion properties. Energy-band theory for semiconductors and crystal field theory have been combined to analyze and assign the SPS bands. There are three types of band-to-band transitions in the SPS of the complexes; i.e., LMCT bands for Cl -> Cr, O -> Cr, N -> Cr. The similarities and differences between the SPS and UV-Vis absorption spectra for the three complexes were compared and reasonably explained. There was a good correlation between the SPS and UV-Vis absorption spectra.

• 出版日期2011-3
• 单位辽宁师范大学