Röwekamp-Krugley Natalia, Reuter Hans
Chemistry, Osnabrück University, Barbarastr. 7, 49069 Osnabrück, Germany.
Acta Crystallogr E Crystallogr Commun. 2024 Aug 6;80(Pt 9):921-925. doi: 10.1107/S2056989024007400. eCollection 2024 Sep 1.
In the title compound, bis-[aqua-(2,2'-bi-pyridine)-fluorido-tin(II)] hexa-fluorido-tin(IV), [SnF(CHN)(HO)][SnF], an ionic mixed-valent tin(II)-tin(IV) compound, the bivalent tin atom is the center atom of the cation and the tetra-valent tin atom is the center atom of the anion. With respect to the first coordination sphere, the cation is monomeric, with the tin(II) atom having a fourfold seesaw coordination with a fluorine atom in an equatorial position, a water mol-ecule in an axial position and the two nitro-gen atoms of the chelating 2,2'-bi-pyridine ligand in the remaining axial and equatorial positions. The bond lengths and angles of this hypervalent first coordination sphere are described by 2-2 and 3-4 bonds, respectively, all of which are based on the orthogonal 5 orbitals of the tin atom. In the second coordination sphere, which is based on an additional, very long tin-fluorine bond that leads to dimerization of the cation, the tin atom is trapezoidal-pyramidally coordinated. The tetra-valent tin atom of the centrosymmetric anion has an octa-hedral coordination. The differences in its tin-fluorine bond lengths are attributed to hydrogen bonding, as the two of the four fluorine atoms are each involved in two hydrogen bonds, linking anions and cations together to form strands.
在标题化合物双[水合-（2,2'-联吡啶）-氟代-锡（II）]六氟代-锡（IV），[SnF(CHN)(HO)][SnF]中，一种离子型混合价态的锡（II）-锡（IV）化合物，二价锡原子是阳离子的中心原子，四价锡原子是阴离子的中心原子。关于第一配位层，阳离子是单体，锡（II）原子具有四重跷跷板配位，一个氟原子在赤道位置，一个水分子在轴向位置，螯合的2,2'-联吡啶配体的两个氮原子在其余的轴向和赤道位置。这个高价第一配位层的键长和键角分别由2-2和3-4键描述，所有这些都是基于锡原子的正交5个轨道。在基于一个额外的、非常长的锡-氟键导致阳离子二聚的第二配位层中，锡原子呈梯形金字塔配位。中心对称阴离子的四价锡原子具有八面体配位。其锡-氟键长的差异归因于氢键，因为四个氟原子中的两个各自参与两个氢键，将阴离子和阳离子连接在一起形成链。
