Two new nickel complexes containing strongly bound multi-sulfur 1,2-dithiolene ligands, [NBu
4
][Ni(bddt)
2
] 1 and [Ni(bddt)
2
] 2 (bddt = 4a,5,6,7,8,8a-hexahydro-1,4-benzodithiin-2,3-dithiolate), have been synthesized and characterized by electrochemical measurements, IR and UV–VIS–NIR spectroscopies. The optical limiting properties of these nickel complexes have been determined with 32 ps laser pulses of 532 nm wavelength. The limiting thresholds of 1 and 2 are ca. 0.6 and 0.7 J cm
–2
, respectively, which are comparable to that observed in C
60
. Such results show that the nickel dithiolene complexes may be new candidates for optical limiting applications. In addition, the neutral complex [Ni(bddt)
2
] 2, which shows remarkable absorption in the near-IR region (ε = 63 000 dm
3
mol
–1
cm
–1
at 1035 nm) and is an excellent candidate as a near-IR dye for Q-switching neodymium lasers, has been additionally characterized by X-ray diffraction.
通过电
化学测量、红外光谱和紫外-可见-近红外光谱,合成并表征了两种含有强结合多
硫 1,2 二
硫环
配体的新
镍络合物,即 [NBu 4 ][Ni(bddt) 2 ] 1 和 [Ni(bddt) 2 ] 2(bddt = 4a,5,6,7,8,8a-六氢-1,4-苯并二
硫杂-2,3-二
硫酸盐)。利用波长为 532 nm 的 32 ps 激光脉冲测定了这些
镍络合物的光学极限特性。1 和 2 的极限阈值分别约为 0.6 和 0.7 J。1 和 2 的极限阈值分别约为 0.6 和 0.7 J cm -2,与在 C 60 中观察到的阈值相当。这些结果表明,二
硫环戊烯镍络合物可能是光学限幅应用的新候选材料。此外,中性络合物 [Ni(bddt) 2 ] 2 在近红外区域显示出显著的吸收(ε = 63 000 dm 3 mol -1 cm -1 ,波长 1035 nm),是 Q 开关
钕激光器近红外
染料的极佳候选物。