Significant geometry and charge difference between the E54- bare clusters of group 14 Zintl anions and their coordinated form in [E5{M(CO)3}2]4- (E = Si, Ge, Sn, Pb; M = Cr, Mo, W) complexes

被引:11
|
作者
Gholiee, Yasin [1 ]
Salehzadeh, Sadegh [2 ]
Khodaveisi, Shiva [2 ]
机构
[1] Malayer Univ, Fac Sci, Dept Chem, Malayer, Iran
[2] Bu Ali Sina Univ, Fac Chem, Hamadan, Iran
关键词
DENSITY-FUNCTIONAL THEORY; STABLE HOMOPOLYATOMIC ANIONS; HOST-GUEST CHEMISTRY; CRYSTAL-STRUCTURES; GERMANIUM CLUSTERS; IONS; ELEMENTS; PENTAPLUMBIDE(2-); APPROXIMATION; AZACRYPTANDS;
D O I
10.1039/c9nj00162j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this paper, at first, the possible structures for E-5(n) Zintl ions (E = Si, Ge, Sn, Pb; n = 0, 2-, 4-) were investigated at the BP86/def2-TZVPP and M06-2X/def2-TZVPP levels of theory. The results showed that E-5(2-) bare clusters, in agreement with their solid state structures, have the minimum energy in the trigonal bipyramid (D-3h), while the neutral E-5 and also E-5(4-) ions, which have not been characterized structurally to date, are stabilized in the oblate trigonal bipyramid (D-3h) and square pyramid (C-4v) geometries, respectively. Then [E-5{M(CO)(3)}(2)](4-) complexes (M = Cr, Mo, W) containing a planar E-5(4-) ring were investigated at the same levels of theory. The results show that the strong interaction of the planar E-5(4-) ring with the two {M(CO)(3)} fragments and significant charge donation from it is the reason for its strained planar geometry. This was further confirmed by NBO and Energy Decomposition Analysis-Natural Orbital for Chemical Valence (EDA-NOCV) as well as analysis of carbonyl vibrational frequencies. The EDA analysis indicated that the interaction energy values (E-int) in the series of these complexes show the same trend as the term for orbital interactions (E-orb).
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页码:7797 / 7805
页数:9
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