Abstract
Abstract The additive effects of metal cations on the fluorescence quantum yield (Φf) were investigated for weak-emissive amino(tetraphenylporphyrinato)antimony(V) bromide (1). When the µmol dm−3 of trivalent metal cations such as Al3+, Ga3+, In3+, and Lu3+ were added to MeCN solution of 1, the Φf was remarkably enhanced. The dependences of Soret band shift and Φf upon the addition of trivalent metal cations revealed that a transition from S2 state to the partially charge-shifted state was prevented by coordinating trivalent metal cations to the axial nitrogen atom of 1. 1 worked as a selective fluorosensor for detecting µmol dm−3 trivalent metal cations.
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