Remote Control of Hydrogen Bond Strengths in Donor-Bridge-Acceptor Systems : The Effects of Metalation on Three-Component Porphyrin and Heteroporphyrin Systems.

• Main Authors: Wei-hao Chen, 陳韋豪
• Other Authors: Hui-Hsu Gavin Tsai
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/99802500891688325236

碩士 === 國立中央大學 === 化學研究所 === 97 === Remote control of hydrogen bond strengths can be modulated in a three-component system containing a hydrogen bonding site(pyrrole),a conjugated bridge and a reaction center (porphyrin). Metalation of the reaction center can trigger intramolecular charge transfer(ICT), thus altering the binding ability of the remote hydrogen-bonding site. In our computational study, we have investigated two topics. The first one is to study the effect of metalation in the porphyrin three-component systems with different bridge positions. In this case, we have found that the porphyrin ring does not induce ICT in the metalated states, so we changed the reaction center to heteroporphyrins. Remote control of hydrogen bond strengths was successfully achieved with heteroporphyrins. The second topic is to construct two different types of multiple-way control systems which have multiple binding sites controlled by one metalation center. One has the similar binding strengths at all binding sites and the other has different binding strengths. We also compare the effectiveness of metalation in terms of remote control in single-way and multiple-way systems.