Rectangular bimetallic diorganotin macrocycle obtained through a combination of metallosupramolecular chemistry with imine bond formation

Variation of the Molecular Conformation, Shape, and Cavity Size in Dinuclear Metalla-Macrocycles Containing Hetero-Ditopic Dithiocarbamate–Carboxylate Ligands from a Homologous Series of N-Substituted Amino Acids

“…The IR spectra for compounds 1 – 18 exhibit bands characteristic for tin-coordinated carboxylate and dithiocarbamate (dtc) groups. − The asymmetric stretching vibrations for the COO – and NCSS – functions were measured in the range of 1603–1643 and 964–998 cm –1 , respectively. The vibrations for the N–C bonds of the dtc fragments gave values intermediate between a single and a double bond (1482–1514 cm –1 ), which can be attributed to the delocalization of π-electron density within the NCSS group of atoms.…”

“…IR (KBr): ṽ= 2957 (s), 2859 (s), 1726 (w), 1617 ν as (OCO) (m), 1500 ν(N-CSS) (m), 1461 (m), 1430 (m), 1373 (m), 1297 (w), 1244 (w), 1173 (w), 1120 (w), 1087 (w), 1024 (w), 970 ν as (CSS) (w), 876 (w), 681 (w) cm −1 . 1 H NMR (200 MHz, CDCl 3 , 20 °C, TMS): 13 [Ph 2 Sn(L7-iPen)] 2 (12). This compound was obtained in the form of a white precipitate using the procedure described for [Ph 2 Sn(L4-Bn)] 2 .…”

“…Representative spectroscopic and mass spectrometric data are summarized in Table 1. 1D and 2D NMR spectra for compounds [Me 2 Sn(L4-Bn)] 2 (1), [nBu 2 Sn-(L5-Bn)] 2 (5), and [Ph 2 Sn(L7-iPen)] 2 (12), for which single crystals suitable for X-ray diffraction analysis could be isolated, are shown in Figures S1−S15 (Supporting Information). For the remaining compounds 2−4, 6−11, and 13−18, the 1 H, 13 C, and 119 Sn NMR spectra were included in the Supporting Information (Figures S16−S60).…”

“…Additionally, high-resolution mass spectra were recorded for each complex (Figures S61−S78, Supporting Information), showing good agreement with the theoretical isotope profiles. A comparison of the experimental and calculated isotope profiles is shown representatively in Figure 1 for compound [Ph 2 Sn(L7-iPen)] 2 (12). 3.2.…”

“…In coordination-driven self-assembly, , organometallic building blocks are of current interest, since the metal–carbon bond connectivity allows to modify a number of chemically important variables of the metal centers such as the Lewis acidity, oxidation potential, coordination number, and steric bulk, among others. , In this context, organotin-based constructs have become relevant during the past years, and an increasing number of 0D, 1D, 2D, and 3D assemblies is documented in the literature. Of these, the vast majority has been derived from carboxylate and dithiocarbamate-functionalized ligands. − Organotin complexes are of interest further because of their fungicidal, bactericidal, insecticidal, and antitumor activity. − …”