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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Influence of counterions on the structure of bis(oxazoline)copper(ii) complexes; An EPR and ENDOR investigation
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Influence of counterions on the structure of bis(oxazoline)copper(ii) complexes; An EPR and ENDOR investigation

机译:抗衡离子对双(恶唑啉)铜(ii)配合物结构的影响; EPR和ENDOR调查

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摘要

X- and Q-band EPR and ENDOR spectroscopy was used to study the structure of a series of heteroleptic and homoleptic copper bis(oxazoline) complexes, based on the (-)-2,2′-isopropylidenebis[(4S)-4-phenyl-2-oxazoline] ligand and bearing different counterions (chloride versus triflate); labelled [Cu ~II(1a-c)]. The geometry of the two heteroleptic complexes, [Cu ~II(1a)] and [Cu ~II(1c)], depended on the choice of counterion. Formation of the homoleptic complex was only evident when the Cu ~II(OTf) _2 salt was used (Cu ~II(Cl) _2 inhibited the transformation from heteroleptic to homoleptic complexes). The hyperfine and quadrupole parameters for the surrounding ligand nuclei were determined by ENDOR. Well resolved ~(19)F and ~1H couplings confirmed the presence of both coordinated water and TfO - counterions in [Cu(1a)].
机译:基于(-)-2,2'-异亚丙基[[4S)-4-],使用X和Q波段EPR和ENDOR光谱研究了一系列杂配和均配的铜双(恶唑啉)配合物的结构。苯基-2-恶唑啉]配体,带有不同的抗衡离子(氯化物与三氟甲磺酸盐);标记为[Cu〜II(1a-c)]。 [Cu〜II(1a)]和[Cu〜II(1c)]这两种杂配物的几何形状取决于抗衡离子的选择。仅当使用Cu〜II(OTf)_2盐时,才形成均纯复合物(Cu〜II(Cl)_2抑制了从杂配物向均纯复合物的转化)。 ENDOR确定周围配体核的超细和四极参数。良好解析的〜(19)F和〜1H偶联证实[Cu(1a)]中同时存在配位水和TfO-抗衡离子。

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