New Symmetrical and Unsymmetrical Nickel-Dithiolene Complexes Useful as Near-IR Dyes and Precursors of Sulfur-Rich Donors
New Symmetrical and Unsymmetrical Nickel-Dithiolene Complexes Useful as Near-IR Dyes and Precursors of Sulfur-Rich Donors
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新型对称和不对称镍-二硫醇配合物可用作近红外染料和富硫供体的前体
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
E. Trogu
中科院分区：
文献类型：
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作者：
P. Deplano;M. L. Mercuri;G. Pintus;E. Trogu
本文介绍了以新配体R2 timdt（带-1电荷的1，3-二烷基咪唑烷-2，4，S-三硫代）和dmit或mnt（dmit = 2-硫代-1，3-二硫杂环戊烯-4，5-二硫纶; mnt =马来腈二硫纶）为基础的新型对称和不对称镍二硫杂环戊烯配合物，它们在880-1400 nm范围内用作近红外染料和电致变色材料。的R2 timdt配体，其中N-电子供体原子的咪唑啉环被迫进入共面与二硫杂环戊烯环，显示是有价值的在shiftiig典型的这类配合物的低能量跃迁在一个区域的显着兴趣的近红外染料，同时保持稳定性。对称的中性络合物在约1000 nm处吸收非常强，这是NIR染料特别感兴趣的区域，以便用于在1064 nm处工作的Q开关Neo_3激光器。此外，这些络合物作为可切换NIR染料工作，因为在可逆还原时吸收移位到约1400 nm。在涉及Pr 2 itimdt和dmit或mnt配体的不对称镍-二硫乙醇配合物中，根据配体和电荷的组合实现了近红外吸收的调节。
Abstract Novel symmetrical and unsymmetrical nickel dithiolene complexes based on a new ligand R2timdt (the -1 charged 1,3-dialkylimidazolidine-2,4,S-trithione) and dmit or mnt (dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate; mnt = maleonitriledithiolate) useful as NIR-dyes and electrochromic materials in the 880-1400 nm region arc described here. The R2 timdt ligand, where N-electron donor atoms of the imidazoline ring are forced into co-planarity with the dithiolene ring, revealed to be valuable in shiftiig the low energy transition typical of this class of complexes in a region of remarkable interest for near-IR dyes, while stability was maintained. The symmetrical neutral complexes absorb very strongly at approximately 1000 nm, region of special interest for NIR-dyes in order to be used in Q-switching Neodymium lasers, which operate at 1064 nm. Moreover these complexes work as switchable NIR-dyes, since the absorption is shifted to approximately 1400 nm on reversible reduction. In the unsymmetrical nickel-dithiolcne complexes involving both the Pr2 itimdt and dmit or mnt ligands a tuning of the NIR-absorption depending on the combination of the ligands and of the charge is achieved.