A pseudotetrahedral nickel(II) complex with a tridentate oxazoline-based scorpionate ligand: chloride[tris(4,4-dimethyloxazolin-2-yl)phenylborato]nickel(II)
A pseudotetrahedral nickel(II) complex with a tridentate oxazoline-based scorpionate ligand: chloride[tris(4,4-dimethyloxazolin-2-yl)phenylborato]nickel(II)
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具有三齿恶唑啉基蝎酸酯配体的伪四面体镍（II）配合物：氯化物[三（4,4-二甲基恶唑啉-2-基）苯基硼酸]镍（II）
DOI：
10.1107/s2053229616012183
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Shiro Hikichi
中科院分区：
文献类型：
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作者：
Tomoaki Takayama;Jun Nakazawa;Shiro Hikichi
聚（吡唑-1-基）硼酸酯由于其基于来自单负电荷硼中心的静电相互作用对阳离子金属离子的高亲和力而被广泛用于配位化合物中。最初的聚（吡唑-1-基）硼酸酯，命名为“蝎子酸酯”，是由已故的Swiatoslaw Trofimenko教授开创的，并且已经扩展到包括具有N-、P-、O-、S-、Se-和C-供体的各种硼酸酯配体。已经开发了具有硼-碳键而不是正常的硼-氮键的蝎形配体，并且在这些新型蝎形配体中，胺和唑类，例如吡啶类、咪唑类和恶唑啉类，已经代替吡唑类用作N-供体。此外，已经开发了多种双和三（恶唑啉基）硼酸酯配体，包括手性配体。三（恶唑啉-2-基）硼酸酯以与三（吡唑-1-基）硼酸酯相同的方式用作表面封端的三齿螯合配体。在标题化合物[Ni（C21 H29 BN 3 O3）Cl]中，NiII离子与来自面封三齿螯合三（4，4-二甲基恶唑啉-2-基）苯基硼酸盐配体的三个N原子和一个氯离子配体以高度扭曲的四面体构型配位。Ni-Cl键长[2.1851（5）<$]与先前报道的三（3，5-二甲基吡唑-1-基）硼氢化物衍生物[2.1955（18）和2.150（2）<$]中发现的键长相当。 由于三（4，4-二甲基恶唑啉-2-基）苯基硼酸酯配体的结构灵活性，分子结构偏离C3 v对称性。
Poly(pyrazol-1-yl)borates have been utilized extensively in coordination compounds due to their high affinity toward cationic metal ions on the basis of electrostatic interactions derived from the mononegatively charged boron centre. The original poly(pyrazol-1-yl)borates, christened `scorpionates', were pioneered by the late Professor Swiatoslaw Trofimenko and have expanded to include various borate ligands with N-, P-, O-, S-, Se- and C-donors. Scorpionate ligands with boron–carbon bonds, rather than the normal boron–nitrogen bonds, have been developed and in these new types of scorpionate ligands, amines and azoles, such as pyridines, imidazoles and oxazolines, have been employed as N-donors instead of pyrazoles. Furthermore, a variety of bis- and tris(oxazolinyl)borate ligands, including chiral ones, have been developed. Tris(oxazolin-2-yl)borates work as facially capping tridentate chelating ligands in the same way as tris(pyrazol-1-yl)borates. In the title compound, [Ni(C21H29BN3O3)Cl], the NiII ion is coordinated by three N atoms from the facially capping tridentate chelating tris(4,4-dimethyloxazolin-2-yl)phenylborate ligand and a chloride ligand in a highly distorted tetrahedral geometry. The Ni—Cl bond length [2.1851 (5) Å] is comparable to those found in a previously reported tris(3,5-dimethylpyrazol-1-yl)hydroborate derivative [2.1955 (18) and 2.150 (2) Å]. The molecular structure deviates from C3v symmetry due to the structural flexibility of the tris(4,4-dimethyloxazolin-2-yl)phenylborate ligand.