一种方酸类近红外染料及其与铁（III）和钴（II）离子络合的光谱性质研究。
Investigation of the spectral properties of a squarylium near-infrared dye and its complexation with Fe(III) and Co(II) ions.
作者信息
Tarazi Leila, Narayanan Nara, Sowell John, Patonay Gabor, Strekowski Lucjan
机构信息
Department of Chemistry, Georgia State University, Atlanta 30303, USA.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2002 Jan 15;58(2):257-64. doi: 10.1016/s1386-1425(01)00542-x.
The spectral features of the squarylium dye NN525 in different solutions and its complexation with several metal ions were investigated. The absorbance maximum of the dye is at 669 nm in tetrahydrofuran. This value matches the output of a commercially available laser diode (650 nm), thus making use of such a source practical for excitation. The emission maximum of the dye in tetrahydrofuran is at 676 nm. The addition of either Fe(III) ion or Co(II) ion resulted in fluorescence quenching of the dye. The detection limit is 6.24 x 10(-8) M for Fe(III) ion and 1.55 x 10(-8) M for Co(II) ion. The molar ratio of the metal to the dye was established to be 1:1 for both metal ions. The stability constant Ks of the metal-dye complex was calculated to be 3.14 x 10(6) M(-1) for the Fe-dye complex and 2.64 x 10(5) M(-1) for the Co-dye complex.
研究了方酸染料NN525在不同溶液中的光谱特征及其与几种金属离子的络合情况。该染料在四氢呋喃中的最大吸收波长为669 nm。此值与市售激光二极管的输出波长（650 nm）相匹配，因此使用这样的光源进行激发是可行的。该染料在四氢呋喃中的最大发射波长为676 nm。加入Fe(III)离子或Co(II)离子均导致该染料的荧光猝灭。Fe(III)离子的检测限为6.24×10⁻⁸ M，Co(II)离子的检测限为1.55×10⁻⁸ M。两种金属离子与染料的摩尔比均确定为1:1。Fe-染料络合物的金属-染料络合物稳定常数Ks经计算为3.14×10⁶ M⁻¹，Co-染料络合物的稳定常数Ks为2.64×10⁵ M⁻¹。
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