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1,4,7,10-tetrakis{2,2 '-bipyridyl-5-ylmethyl-bis(2,2 '-bipy-ridine)ruthenium(II)}-1,4,7,10-tetraazacyclododecane, a macrocyclic sensor for positively charged species
ANNALI DI CHIMICA.  v. 91. no. 9-10.   2001-09. p. 517 - 530... issn: 0003-4592 .   

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