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Abstract
Two mononuclear Co(II) N 6-benzylaminopurine compounds, [Co(6-BA-H2)2(H2O)4] · (R)2 · 4.5H2O (1) and [Co(6-BA-H)2(H2O)Cl3]Cl · H2O (2) (6-BA = N 6-benzylaminopurine (C5H2N3NH)(NH)CH2(C6H5), H3R = 5-sulfosalicylic acid (C6H3)CO2H(OH)SO3H), are reported. Compound 1 possesses a 3-D supramolecular structure built via H-bond and π–π stacking interactions that contains a mononuclear six-coordinate [Co(6-BA-H2)2(H2O)4]6+. Compound 2 also exhibits a 3-D supramolecular framework with mononuclear six-coordinate cation [Co(6-BA-H)2(H2O)Cl3]+. Luminescence studies at room temperature show that 1 (λ ex = 268 nm) displays two strong fluorescent emissions centered at 326.8 nm and 356.9 nm, while 2 (λ ex = 233 nm) exhibits a weaker peak emitted at 342.8 nm upon 6-BA-complexation of two different second ligands H3R/Cl− with Co(II).
