We report a comparative analysis of experimental and theoretical vibrational spectra recorded in the frequency region of 700-100 cm–1 for mono-o-iminosemiquinone tin(IV) complexes with general formulas LSnR2Cl (1-5) and LSnR3 (6, 7) (L is the 4,6-di-tert-butyl-N-(2,6-di-iso-propylphenyl)-o-iminobenzoquinone radical anion, R = Me (1, 6), Et (2), n-Bu (3), t-Bu (4), Ph (5, 7)). It is established that absorption bands of ν(Sn–O) and ν(Sn–N) stretching vibrations in the studied compounds occur at 460-360 cm–1 and 340-350 cm–1, respectively. The position of the ν(Sn–O) absorption band correlates with the Sn–O bond length. In particular, the band is redshifted by 20 cm–1 in complex 6, where this bond is 0.2 Å longer than in other compounds. It is shown that parameters ν(Sn–O), a(117, 119Sn) and bond lengths d(Sn–O), d(Sn–N), and d(Sn–C) in the complexes depend on four (inductive, resonance, polarization, and steric) effects of tin-bonded substituents.

中文翻译：

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远红外区的振动光谱和邻亚氨基半醌锡 (IV) 配合物中取代基的影响

我们报告了在 700-100 cm-1 频率范围内记录的单邻亚氨基半醌锡 (IV) 配合物的实验和理论振动光谱的比较分析，通式为 LSnR2Cl (1-5) 和 LSnR3 (6, 7) (L为4,6-二叔丁基-N-(2,6-二异丙基苯基)-邻亚氨基苯醌基阴离子，R = Me (1, 6), Et (2), n- Bu (3), t-Bu (4), Ph (5, 7))。已确定，所研究化合物中 ν(Sn-O) 和 ν(Sn-N) 伸缩振动的吸收带分别出现在 460-360 cm-1 和 340-350 cm-1。ν(Sn-O) 吸收带的位置与 Sn-O 键长相关。特别是，配合物 6 中的谱带红移了 20 cm-1，其中该键比其他化合物中的键长 0.2 Å。结果表明，参数 ν(Sn-O)、a(117, 119Sn) 和键长 d(Sn-O)、d(Sn-N)、