Covalency of neptunium(IV) tris(cyclopentadienyl) compounds from Moessbauer spectra
Covalency of neptunium(IV) tris(cyclopentadienyl) compounds from Moessbauer spectra
复制标题
穆斯堡尔谱中镎(IV)三(环戊二烯基)化合物的共价
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
J. A. Stone
中科院分区：
文献类型：
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作者：
D. Karraker;J. A. Stone
从NPCP/sub3/OR(R=烷基)、NPCP/sub3/R和NpCpAr(Ar=芳基)的/sup 237/NP Moessbauer谱测量的异构体位移被用作Np(IV)配体键合的共价性的度量。NPCP/sub3/-n-Bu和NPCP/sub3/C/sub6/H/sub4/C/sub2/H/sub5/键的异构体位移对NP-n-Bu和NP-C/sub6/H/sub4/C/sub2/H/sub5/键表现出较强的Sigma特征。NP-OR键的西格玛性质是明确的，但不太明显。NPCP/sub4/键的共价性较低归因于NPCP/sub4/中的NP-C键比NPCP/sub3//sup+/化合物中的长。Np(MeCp)Cl/sub3/中的/sup 237/NP异构体位移。2THF表明该化合物中的MeCp配体为sigma键。
Isomer shifts measured from the /sup 237/Np Moessbauer spectra of NpCp/sub 3/OR (R = alkyl), NpCp/sub 3/R, and NpCpAr (Ar = aryl) are used as a measure of the covalency in Np(IV) ligand bonding. The isomer shifts in NpCp/sub 3/-n-Bu and NpCp/sub 3/C/sub 6/H/sub 4/C/sub 2/H/sub 5/ show a strong sigma character for the Np-n-Bu and Np-C/sub 6/H/sub 4/C/sub 2/H/sub 5/ bonds. The sigma character of Np-OR bonding is definite but less pronounced. The comparatively low covalency in the bonding of NpCp/sub 4/ is ascribed to longer Np-C bonds in NpCp/sub 4/ than in NpCp/sub 3//sup +/ compounds. The /sup 237/Np isomer shift in Np(MeCp)Cl/sub 3/ . 2THF indicates that the MeCp ligand is sigma-bonded in this compound.