Coordination-Driven Self-Assembly Of M3L2 Trigonal Cages From Preorganized Metalloligands Incorporating Octahedral Metal Centers And Fluorescent Detection Of Nitroaromatics

Content Provider	Indian Institute of Science (IISc)
Author	Wang, Ming Vajpayee, Vaishali Shanmugaraju, Sankarasekaran Zheng, Yao Rong Zhao, Zhigang Kim, Hyunuk Mukherjee, Partha Sarathi Chi, Ki Whan Stang, Peter J.
Copyright Year	2011
Abstract	The design and preparation of novel M3L2 trigonal cages via the coordination-driven self-assembly of preorganized metalloligands containing octahedral aluminum(III), gallium(III), or ruthenium(II) centers is described. When tritopic or dinuclear linear metalloligands and appropriate complementary subunits are employed, M3L2 trigonal-bipyramidal and trigonal-prismatic cages are self-assembled under mild conditions. These three-dimensional cages were characterized with multinuclear NMR spectroscopy (H-1 and P-31) and high-resolution electrospray ionization mass spectrometry. The structure of one such trigonal-prismatic cage, self-assembled from an arene ruthenium metalloligand, was confirmed via single-crystal X-ray crystallography. The fluorescent nature of these prisms, due to the presence of their electron-rich ethynyl functionalities, prompted photophysical studies, which revealed that electron-deficient nitroaromatics are effective quenchers of the cages' emission. Excited-state charge transfer from the prisms to the nitroaromatic substrates can be used as the basis for the development of selective and discriminatory turn-off fluorescent sensors for nitroaromatics.
File Format	PDF
Journal	PeerReviewed
Language	English
Publisher	American Chemical Society
Publisher Date	2011-02-21
Access Restriction	Authorized
Subject Keyword	Inorganic & Physical Chemistry
Content Type	Text
Resource Type	Article