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Color in Coordination Complexes
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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高能光敏感综合体建设的协调竞争战略.

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概括

为功能性能量材料合成了新的能量协调化合物 (ECC). 基于铜的ECC显示出优异的激光响应,表明其作为激光启动器的潜力.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学 化学 化学
  • 能量材料 能量材料

背景情况:

  • 由于其复杂的结构,高维能量协调化合物 (ECC) 具有高稳定性和低灵敏性.
  • 在燃烧催化和不敏感爆炸物等应用中,ECCs具有价值.

研究的目的:

  • 为了合成和描述新的ECC,使用5,5'-dinitro-4H,4'H-3,3'-bi(1,2,4-triazole) (DNBT) 作为配体.
  • 评估合成ECC的激光诱导点火和引爆能力,以作为激光启动器的潜在用途.

主要方法:

  • 通过修改金属中心并使用DNBT和4H-1,2,4-triazol-4-amine (4-ATr) 连接物合成七种ECC.
  • 激光点火和引爆试验是在含水量减少的ECC上进行的.
  • 为了分析电荷转移行为,进行了理论计算和结构研究.

主要成果:

  • 成功合成了七个ECC,具有不同的协调结构.
  • [Cu2{DNBT}2{4-ATr}3]表现出极好的激光响应,具有较低的最小激光启动能量 (11mJ) 和较短的点火延迟 (2.31 ms).
  • 尽管光热转换效率高,但[Co2{\DNBT}2{\4-ATr}3{\H2O}2]对激光反应的敏感性较低,可能是由于含水量,尽管光热转换效率高.

结论:

  • 合成的ECC,特别是基于铜的化合物,显示出作为激光启动器的前景.
  • 在ECC中存在水分子可以影响它们对激光诱导启动的敏感性.
  • 了解电荷转移机制对于设计先进的能量材料至关重要.