Light-Emitting Molecular Machines: pH-Induced Intramolecular Motions in a Fluorescent Nickel(II) Scorpionate Complex
作者:Luigi Fabbrizzi、Francesco Foti、Maurizio Licchelli、Paola M. Maccarini、Donatella Sacchi、Michele Zema
DOI:10.1002/1521-3765(20021104)8:21<4965::aid-chem4965>3.0.co;2-x
日期:2002.11.4
the corresponding nickel(II) complex, binding of the pendant arm to the metal is pH controlled. In particular, at pH 4.3, the sulfonamide group deprotonates and coordinates the NiII center, giving rise to a complex of trigonal bipyramidal stereochemistry, as shown by X-ray diffraction studies performed on the crystalline complex salt. At pH 7.5, an OH- ion binds the metal and a six-coordinate species
已经合成了具有含丹磺酰胺基团的侧链的类环素大环。在相应的镍(II)络合物中,侧链与金属的结合受pH控制。特别地,在pH 4.3下,磺酰胺基团去质子化并配位NiII中心,从而产生了三角双锥体立体化学的络合物,如对结晶络合物盐进行的X射线衍射研究所示。在pH 7.5时,OH离子与金属结合,形成六配位物质。侧链上丹磺酰基亚基的发射性质发生变化,表明悬垂臂与NiII中心的结合/脱离。当侧链未配位时,该侧链的荧光较高;而当磺酰胺基团与金属结合时,该侧链的荧光较低。