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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Diversity of the coordination modes of Croconate Violet. Crystal structures, spectroscopic characterization and redox studies of mono-, di-and poly-nuclear iron (II) complexes
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Diversity of the coordination modes of Croconate Violet. Crystal structures, spectroscopic characterization and redox studies of mono-, di-and poly-nuclear iron (II) complexes

机译：紫罗兰色的协调模式的多样性。单核，二核和多核铁（II）配合物的晶体结构，光谱表征和氧化还原研究

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摘要

The crystal structures of three iron (II) complexes with Croconate Violet [3,5-bis (dicyanomethylene) cyclopentane-1,2,4-trionate dianion = L~(2-)] have been determined: K_2 [FeL_2 (H_2O)_4]1, {[Fe(2,2'-bipy)L(H_2O_2)]·H_2O}_2 2 and {[FeL(H_2O_2)]·2H_2O}_n 3. Complex 1 consists of dianionic pseudo-octahedral mononuclear entities containing two N-mono-coordianted lgiands in trans positions. Complex 2 consists of dimeric entities with metal atoms bridged by two N-coordinated Croconate Violet ligands. Complex 3 has a polymeric structure with both N-and O-coordinated Croconate Violet ligands: each iron (II) atom is bonded to three different Croconate Violet dianions and each ligand bonds three metal atoms. The magnetic proper5ties have been investigated in the 2-300 K temperature range for complexes 2 and 3. Magnetic susceptibility measurements for these two complexes show the presence of a long distance magnetic coupling (ferromagnetic coupling in 2 with J = +0.18 cm~(-1) and antiferromagnetic coupling in 3 with J = -0.19 cm~(-1)). The redox properties of the three complexes in dmf solution are compared to those of the free ligand.
机译：已确定三种具有铁酸紫[[3,5-双（二氰基亚甲基）环戊烷-1,2,4-三酸双阴离子= L〜（2-）]]的铁（II）配合物的晶体结构：K_2 [FeL_2（H_2O） _4] 1，{[Fe（2,2'-bipy）L（H_2O_2）]·H_2O} _2 2和{[FeL（H_2O_2）]·2H_2O} _n3。络合物1由双阴离子伪八面体单核实体组成，其中反位的两个N-单配位配体。配合物2由具有两个N配位的紫罗兰色紫罗兰配体桥接的金属原子的二聚体实体组成。配合物3具有N和O配位的紫罗兰色紫罗兰配体的聚合结构：每个铁（II）原子与三个不同的紫罗兰色紫罗兰二价键相连，每个配体与三个金属原子键合。研究了配合物2和3在2-300 K温度范围内的磁性。对这两种配合物的磁化率测量表明存在长距离磁耦合（2中的铁磁耦合，J = +0.18 cm〜（- 1）和3中的反铁磁耦合，J = -0.19 cm〜（-1））。将dmf溶液中三种复合物的氧化还原特性与游离配体的氧化还原特性进行了比较。

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