首页> 美国卫生研究院文献>ACS Omega >{CpFeII(CO)2SnII(Macrocycle•3–)} Radicals with Intrinsic Charge Transferfrom CpFe(CO)2 to Macrocycles (Cp: Cp or Cp*); EffectiveMagnetic Coupling between Radical Trianionic Macrocycles•3–
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{CpFeII(CO)2SnII(Macrocycle•3–)} Radicals with Intrinsic Charge Transferfrom CpFe(CO)2 to Macrocycles (Cp: Cp or Cp*); EffectiveMagnetic Coupling between Radical Trianionic Macrocycles•3–

机译:{CpFeII(CO)2SnII(Macrocycle•3-–)}具有固有电荷转移的自由基从CpFe(CO)2到大环(Cp:Cp或Cp *);有效自由基三阴离子大环之间的磁耦合•3–

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摘要

Neutral {CpFeII(CO)2[SnII(Pc•3–)]} {Cp is cyclopentadienyl (>1, >2) or Cp* is pentamethylcyclopentadienyl (>3); Pc: phthalocyanine}, {Cp*FeII(CO)2[SnII(Nc•3–)]} (>4, Nc: naphthalocyanine), and {CpFeII(CO)2[SnII(TPP•3–)]} (>5, TPP: tetraphenylporphyrin) complexes in which CpFeII(CO)2 fragments (Cp: Cp or Cp*) are coordinated to SnII(macrocycle•3–) have been obtained. The product complexes were obtained at the reaction of charge transfer from CpFeI(CO)2 (Cp: Cp or Cp*) to [SnII(macrocycle2−)] to form the diamagnetic FeII and paramagnetic radical trianionic macrocycles. As a result, these formally neutral complexes contain S = 1/2 spins delocalized over the macrocycles. This provides alternation of the C–Nimine or C–Cmeso bonds in the macrocycles, the appearance of new bands in the near-infrared spectra of the complexes, and blue shift of both Soret and Q-bands. The {CpFeII(CO)2SnII(macrocycle•3–)} units (Cp: Cp or Cp*, macrocycle: Pc or Nc) form closely packed π-stacking dimers in >1 and >3 or one-dimensional chains in >2 and >4 with effective π–π interaction between the macrocycles.Such packing allows strong antiferromagnetic coupling between S = 1/2 spins. Magnetic interaction can be described wellby the Heisenberg model for the isolated dimers in >1 and >3 with exchange interaction J/kB = −78 and −85 K, respectively. Magneticbehavior of >2 and >4 is described well bythe model that includes contributions from an antiferromagneticallycoupled S = 1/2 dimer (Jintra) and a Heisenberg S = 1/2 chain with alternatingantiferromagnetic spin exchange between the neighbors (Jinter). Compound >2 demonstrates large intradimerinteraction of Jintra/kB = −54 K and essentially weaker interdimer exchangeinteractions of Jinter/kB = −6 K, whereas compound >4 showsstrong magnetic coupling of spins within the dimers (Jintra/kB = −170 K)as well as between the dimers (Jinter/kB = −40 K). Compound {CpFeII(CO)2[SnII(TPP•3–)]}(>5) shows no π–π interactions betweenthe porphyrin macrocycles, and magnetic coupling is weak in this case(Weiss temperature is −5 K). Preparation of a similar complexwith indium(III) chloride phthalocyanine yields {CpFe(CO)2[In(Pc2–)]} (>6). In this complex,indium(III) atoms are reduced instead of the phthalocyanine macrocyclesthat explains electron paramagnetic resonance silence of >6 in the 4–295 K range.
机译:中性{CpFe II (CO)2 [Sn II (Pc •3 – )]}} {Cp是环戊二烯基(> 1 < / strong>,> 2 )或Cp *是五甲基环戊二烯基(> 3 ); Pc:酞菁},{Cp * Fe II (CO)2 [Sn II (Nc •3 – )]}}(> 4 ,Nc:萘酞菁)和{CpFe II (CO)2 [Sn II (TPP •3 – )]”] }(> 5 ,TPP:四苯基卟啉)配合物,其中CpFe II (CO)2片段(Cp:Cp或Cp *)与Sn II配位(macrocycle •3 – )。在电荷转移反应中,从CpFe I (CO)2(Cp:Cp或Cp *)到[Sn II (大环 2) -)]形成抗磁性的Fe II 和顺磁性的自由基三阴离子大环。结果,这些形式上中性的络合物包含在大环上离域的S = 1/2自旋。这提供了大环中C–Nimine或C–Cmeso键的交替,复合物的近红外光谱中新谱带的出现以及Soret和Q谱带的蓝移。 {CpFe II (CO)2Sn II (macrocycle •3 – )}单位(Cp:Cp或Cp *,大环:Pc或Nc)在> 1 和> 3 中形成紧密堆积的π堆叠二聚体,或者在> 2 和> 4 中形成一维链大环之间有效的π-π相互作用。这样的堆积使得S = 1/2自旋之间具有强反铁磁耦合。电磁相互作用可以很好地描述通过Heisenberg模型对> 1 和> 3 中的孤立二聚体进行交换相互作用,分别为J / kB = -78和-85K。磁性> 2 和> 4 的行为被很好地描述为该模型包括反铁磁的贡献耦合S = 1/2二聚体(Jintra)和海森堡S = 1/2链,交替邻居之间的反铁磁自旋交换(Jinter)。化合物> 2 表现出较大的二聚体Jintra / kB = -54 K的相互作用和弱的二聚体交换Jinter / kB的相互作用= -6 K,而化合物> 4 显示二聚体中自旋的强磁耦合(Jintra / k B = -170 K)以及二聚体之间(J inter / k B = −40 K)。化合物{CpFe II (CO) 2 [Sn II (TPP •3 – )]}}(> 5 )显示之间没有π–π相互作用卟啉大环,在这种情况下磁耦合很弱(魏斯温度为-5 K)。制备类似的复合物氯化铟(III)酞菁的产率为{CpFe(CO) 2 [In(Pc 2 – )]}}(> 6 )。在这个复杂的地方还原铟(III)原子而不是酞菁大环解释了在4–295 K范围内> 6 的电子顺磁共振静音。

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