The inside cover picture shows an electrochemical oxidative Csp3‐H/S‐H activation with hydrogen evolution for the synthesis of tetrasubstituted olefins. This method features very high atom economy, besides hydrogen gas, under the base‐free, transition met‐al‐free, and oxidants‐free conditions, no other by‐products were generated. More details are discussed in the article by Lei et al. on page 547–551.
Spiropyrans are the most studied families of func- tional materials due to their reversible structural con- version in response to external optical, chemical, and thermal stimulation[1]. Irradiation with ultraviolet light causes formation of an extended π-conjugation open form (merocyanine form) by heterolytic cleavage of the C (spiro)-O bond, which generates an intense ab- sorption in the visible region. Under the irradiating of visible light, the opened form will come back to the closed spi… 相似文献
The hydrothermal reaction of CuBr2 and CuBr with phen·H2O (phen= 1,10-phenanthroline) in a molar ratio of 1:1:1.5 gave birth to the first copper-halo cationic cluster [Cu2^Ⅱ Cu2^Br4 (phen)4 ] ^2+(1) with tetranuclear anionic cluster [Cu4Br6]^2-. Changing the precursors or their molar ratios, two mononuclear complexes [Cu(phen)2Br]Br·H2O (2) and [Ni(phen)3][CuCl2]2 (3) as well as two unusual copper-halo chains found in polymers [Cu2Br2(phen)]∞ (4) and [Cu^ⅡCu3^ⅠBr2Ⅰ3 (phen)2 ]∞ (5) were obtained. The (Cu2Br2)∞ chain of 4 looks like a linearar ray of hexagons based on fused Cu3Br3 units, and the linear (Cu3Ⅰ3Br^-)∞ chain of 5 is an alternate combination of the rhombic Cu2I2 cores and the Cu4I4Br2^2- units. In addition, the hydrothermal reaction of CuBr2 with NA(NA=nicotinic acid) or INA (INA =isonicotinic acid) resulted in the syntheses of two compounds [CuBr(NA)] (6) and [CuBr(INA)]∞(7) containing staircase chain. Among them the third-order non-linear optical properties of 2, 5, 6 and 7 were investigated and all exhibit the reverse saturable absorption (α2〉0) and self-defocusing performance (n2〈0). 相似文献