Polysulfonylamine

Spontaneously Organizing Metal Connectors as Supramolecular Structure Directors of Two‐ and Three‐Dimensional Organometallic Assemblies

“…Quite surprisingly, however, the two NÀSn distances of 2.65 and 2.63 ä, found along the c axis considerably exceed the usual length of about 2.33 ä typical of spacer I (see Tables 1 and 2), suggesting here unusually weak coordinative interactions. Actually, an SnÀN distance of 2.63 ä would exceed the sum of the covalent radii of Sn and N [18] by about 0.5 ä. Accounting here for the tightly anchored bpy molecules and probably negligible coordinative Sn ¥¥ N interaction along the c axis, the puckered sheets of 9 (vide supra) turn out to be based exclusively on the presence of spacers of type IV as metal-connecting building blocks.…”

“…It is also noteworthy that, with the exception of compound 11, the nitrogen base is never coordinated directly to the tin atom, although related compounds involving for example (bpy)N 3 SnR 3 bonds have been reported. [18] The O ¥¥ N(bpy) distances found in 9 are unusually short. In view of the absence of any well-defined type I spacer in 9, the discovery of other 2D or 3D assemblies involving exclusively more extended, supramolecular spacers (than those of type I and type II) does not appear unlikely.…”

Syntheses, characterizations, and crystal structures of organotin(IV) chloride complexes with 4,4′‐bipyridine

“…However, the coordination geometry about Sn(IV) of molecules A and B is a trigonal bipyramid in which three phenyl groups form the equatorial plane, while one nitrogen of the ligand and the halogen occupy the apical positions. And in molecule B, the tin-tin separation across 4,4 -bpy is 7.048Å and the pyridine rings of 4,4 -bpy are coplanar (0 • dihedral angle), two chlorine and two nitrogen atoms are located in the chain, the angles Cl(2) Sn(2) N(3) 175.21 (19) • and Cl(2A) Sn(2A) N(3A) 175.35 (19) • are all very close [24]. The Sn Cl distances are 2.5153(17)Å for molecule A and 2.4927(16)Å for molecule B respectively, and are in the ranges reported in the literature for five-coordinated organotin(IV) chloride (2.432-2.613) [25].…”

Self-assembly of triorganotin(IV) moieties with 2,3,4,5-tetrafluorobenzoic acid and 4,4′-bipy, triphenylphosphine oxide or phen: Syntheses, characterizations and supramolecular structures

“…The chemical shifts of the signal for the methyl groups (d = 0.61-1.21 ppm) and the phenyl group (d = 7.21-7.76 ppm) appear at almost the same position as in the ligands. In addition, the resonance at 7.86-8.74 ppm are attributed to the protons of 4,4 0 -bipy and the resonance at 7.26-7.81 ppm are signed to the protons of phen [11]. In 13 C NMR spectra, the position of the carboxylate carbon moved to the lower field in all the complexes shifts, as compared with the ligand acid, indicating participation of the carboxylic group in coordination to tin(IV) [12].…”