The complexes [Ln(DippForm)₂(QAr)(THF)] [DippForm = N,N′‐(2,6‐diisopropylphenyl)formamidinate; Ln = Sm, Yb; QAr = SPh, SePh, TePh, SeC₆F₅, Se(p‐C₆F₄OMe)] were synthesized by reduction of corresponding dichalcogenides Ar₂Q₂ with the Ln^II formamidinates, [Ln(DippForm)₂(THF)₂]. All complexes with QPh ligands have similar molecular structure (determined by X‐ray diffraction), they are mononuclear due to the effective shielding of the central atom by the bulky amidinate ligands, and possess transoid disposition of the latter. The complexes with fluorinated phenyl groups (Ar^F) possess an additional coordination of an o‐F atom to the lanthanide ion. Only the compounds [Yb(DippForm)₂(QAr^F)(THF)] easily lose the coordinated THF due to the sterically crowded coordination sphere, and the addition of THF is reversible even at ambient temperature. The Sm compounds are stable towards elimination of THF upon moderate heating. Similar crystal packing is found for most of the complexes, except for [Sm(DippForm)₂(SPh)(THF)], [Yb(DippForm)₂(SeC₆F₄OMe)(THF)] and [Yb(DippForm)₂(SeC₆F₅)], which was rationalized as a consequence of interaction of FormDipp ligands from neighboring molecules to form intermolecular junctions. Analogous junctions were found in the majority of known complexes with Ln(DippForm)₂ moiety (for all lanthanides). In the IR spectra the bands characteristic to the C–N, C–F and C–O bonds were revealed, some of which are noticeably influenced by the type of co‐ligands.

中文翻译：

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镧系（Sm，Yb）芳硫族油酸酯配合物中甲酰胺酸配体的立体影响和分子间相互作用。

配合物[Ln（DippForm）₂（QAr）（THF）] [DippForm = N，N' -（2,6-二异丙基苯基）甲ami酸盐; Ln = Sm，Yb; QAR = SPh上，SEPH，TePh，仲₆ ˚F ₅，硒（p -C ₆ ˚F ₄ OME）]通过还原相应的二硫属化物合成的Ar ₂ Q ₂与LN ^II甲脒，[LN（DippForm）₂（THF）₂ ]。所有具有QPh配体的配合物都具有相似的分子结构（通过X射线衍射测定），它们是单核的，这是由于庞大的a基配体有效地屏蔽了中心原子，并具有后者的变型配置。具有氟化苯基基团（Ar ^F）的配合物具有o- ^F原子与镧系元素离子的额外配位。由于空间拥挤的配位球，仅化合物[Yb（DippForm）₂（QAr ^F）（THF）]容易失去配位的THF，即使在环境温度下，THF的添加也是可逆的。Sm化合物在适度加热下对消除THF稳定。除[Sm（DippForm）₂（SPh）（THF）]，[Yb（DippForm）₂（SeC ₆ F ₄ OMe）（THF）]和[Yb（DippForm）]外，大多数配合物都具有相似的晶体堆积₂（秒₆F ₅）]，这是由于来自相邻分子的FormDipp配体相互作用形成分子间连接而合理化的结果。在大多数已知的具有Ln（DippForm）₂部分的配合物中（对于所有镧系元素）都发现了类似的连接。在红外光谱中，发现了C–N，C–F和C–O键的特征谱带，其中一些显着受到共配体类型的影响。