Cyanometallates as Halogen Bond Acceptors
Cyanometallates as Halogen Bond Acceptors
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作为卤素键受体的氰金属盐
DOI:
10.1021/cg200942u
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发表时间:
2011
影响因子:
3.8
通讯作者:
Ormond-Prout J
中科院分区:
文献类型:
--
作者:
Ormond-Prout J
Two families of halopyridnium hexacyanometallate salts, (3-XpyMe)3[M(CN)6] and (3,5-X2pyMe)3[M(CN)6] (X = I, Br; 3-XpyMe =N-methyl-3-halopyridinium; 3,5-XpyMe =N-methyl-3,5-dihalopyridinium; M = Cr, Fe, Co), have been synthesized and characterized by single crystal X-ray diffraction. Five of the six members of each family are characterized as isostructural compounds, two structures are reported as solvates, (3-IpyMe)3[Fe(CN)6]·2MeCN (2·2MeCN) and (3,5-Br2pyMe)3[Cr(CN)6]·4H2O (10·4H2O), and the solvate (3-IpyMe)3[Co(CN)6]·2MeCN (3·2MeCN) has been characterized in addition to the unsolvated3. All halogens participate in halogen bonding, forming C–X···NC(M) halogen bonds and in one case a C–Br···O halogen bond (in10·4H2O). The halogen bond distances are shorter than the corresponding sum of van der Waals radii, and stronger interactions are formed by iodine than bromine (I···N 2.789(7)–3.116(7),RIN0.790–0.883; Br···N 2.884(3)–3.166(2),RBrN0.848–0.931). Longer halogen bonds are formed in10·4H2O (Br···N 3.041(6)–3.380(6),RBrN0.894–0.994) due to competition from O–H···N hydrogen bonding. All halogen bonds have interaction geometries at the halogen close to linearity (most have C–X···N > 165°; smallest angle is 154.1(3)°). The geometry of interaction of the halogen bond donor (C–X) with the cyanide ligand either suggests interaction predominantly with theexolone pair of the nitrogen atom (CN···X > 145°) or predominant involvement of the CN π-bond in the halogen bond (CN···X < 105°) acceptor role. The former are shorter interactions than the latter. Halogen bonds become shorter across each isostructural series for Cr > Fe > Co, and this is discussed in the context of metal-to-cyanide π-back-donation.
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DOI:
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发表时间:
2006
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
--
发表时间:
2002
期刊:
影响因子:
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DOI:
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发表时间:
1996
期刊:
影响因子:
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作者:
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通讯作者:
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影响因子:
4.4
作者:
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DOI:
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发表时间:
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期刊:
Comptes Rendus Chimie (in press)
影响因子:
--
作者:
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