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Ligand Coordination in Bis(β-diketonato) d Metals: The Mn(II) Case of D2h versus D2d Symmetry
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-03-13 00:00:00 , DOI: 10.1021/acs.inorgchem.8b03429
Raphael J. F. Berger 1 , Georgiy V. Girichev 2 , Nina I. Giricheva 3 , Arseniy A. Otlyotov 2 , Angelika A. Petrova 2
Affiliation  

The structure of free manganese(II) bis-acetylacetonate [Mn(acac)2] was determined experimentally by gas-phase electron diffraction. The vapor at 197(5) °C is composed of a single conformer of Mn(acac)2 in D2d symmetry with a central structural motif of an elongated MnO4 tetrahedron with a Mn–O distance (re) of 2.035(5) Å and a bond angle in chelate rings (∠O–Mn–O) of 89.4(6)°. This result contradicts the predicted planar structure of the MO4 moiety (D2h) with a short Mn–O distance (re) of 1.771 Å from a MC(5i5)QDPT2 calculation. From these findings and by comparison with data from the literature, we conclude that in general in bis(β-diketonato) coordination compounds of d metals there is a perpendicular arrangement of the two ligands for d0, d5, and d10 coordination centers and a planar arrangement (D2h) for others.

中文翻译:

Bis(β-diketonato)d金属中的配体配位:D 2 h相对于D 2 d对称的Mn(II)情况

通过气相电子衍射实验确定了游离的双乙酰丙酮锰(II)[Mn(acac)2 ]的结构。在197(5)的蒸气°C由锰(ACAC)的单一构象异构体2d 2 d对称性具有细长的MnO的中央结构基序4四面体与MnO的距离(ř Ë)的2.035( 5)and,螯合环的键角(∠O–Mn–O)为89.4(6)°。该结果与具有短Mn–O距离(r e)的MO 4部分(D 2 h)的预测平面结构相矛盾。MC(5i5)QDPT2计算得出的1.771Å)。根据这些发现并与文献数据进行比较,我们得出结论,通常在d金属的bis(β-diketonato)配位化合物中,d 0,d 5和d 10配位中心的两个配体垂直排列以及其他的平面布置(D 2 h)。
更新日期:2019-03-13
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