Synthesis and characterization of di‐n‐butyltin(IV) complexes with 4′/2′‐nitrobiphenyl‐2‐carboxylic acids: X‐ray crystal structures of [{(n‐C₄H₉)₂Sn(OCOC₁₂H₈NO₂−4′)}₂O]₂ and (n‐C₄H₉)₂Sn{OCOC₁₂H₈NO₂−4′}₂

Abstract

. These compounds were characterized by elemental analysis, IR and NMR ( 1 H, 13 C and 119 Sn) spectroscopy. The IR spectra of these compounds indicate the presence of anisobidentate carboxylate groups and non-linear C-Sn-C bonds. From the chemical shifts δ ( 119 Sn) and the coupling constants 1 J( 13 C, 119 Sn), the coordination number of the tin atom and the geometry of its coordination sphere have been suggested. [{(n-C 4 H 9 ) 2 Sn(OCOC 12 H 8 NO 2 -4 )} 2 O] 2 (1) exhibits a dimeric structure containing distannoxane units with two types of tin atom with essentially identical geometry. To a first approximation, the tin atoms appear to be pentacoordinated with distorted trigonal bipyramidal geometry. However, each type of tin atom is further subjected to a sixth weaker interaction and may be described as having a capped trigonal bipyramidal structure. The diffraction study of the complex (n-C 4 H 9 ) 2 Sn(OCOC 12 H 8 NO 2 -4 ) 2 (3) shows a six-coordinate tin in a distorted octahedral frame containing bidentate asymmetric chelating carboxylate groups, with the n-Bu groups trans to each other. The n-Bu-Sn-n-Bu angle is 152.8 • and the Sn-O distances are 2.108(4) and 2.493(5)Å. The oxygen atom of the nitro group of the ligand does not participate in bonding to the tin atom in 1 and 3. Crystals of 1 are triclinic with space group P1 and of that of 3 have orthorhombic space group Pnna.

Synthesis, Chemical Characterization and Biological Screening for Cytotoxicity and Antitumor Activity of Organotin (IV) Derivatives of 3,4-Methylenedioxy 6-nitrophenylpropenoic Acid

“…solutions (a non-coordinating solvent). It is reported [20,21] can be predicted that diorganotin (IV) species, possess skew-trapezoidal bipyramidal geometries with the lower apparent coordination number arising from the asymmetric coordination mode of the carboxylate ligand [23,24].…”

Synthesis, characterizations and crystal structures of di-n-butyltin(IV) complexes with heteroatomic (N, O or S) acid

“…The 13 C NMR data for the complexes 1-4 are consistent with a dimeric tetraorganostannoxane structure. Although at least two different types of carboxylate groups are present, only single resnances are observed for the COO group in the 13 [14].…”

“…Although at least two different types of carboxylate groups are present, only single resnances are observed for the COO group in the 13 [14]. And the calculated h approach to the C-Sn-C angles in the solid state, too.…”

“…Although the Sn(1)-O(2) 2.519 (15) A and Sn (1)-O(5) 2.581 (15) A bond lengths is longer than the sum of the covalent radii of the tin and oxygen 2. 13 A, it is nevertheless significantly below the sum of the van der WaalÕs radii of these atoms, 3.68 A [17]. Besides, intermolecular non-bonded SnÁ Á ÁO interactions are recognized in the crystallographic analysis of complex 8.…”

“…Infrared-spectra were recorded on a Nicole-460 spectrophotometer using KBr discs and sodium chloride optics. 1 H and 13 C NMR spectra were recorded on a Bruker AMX-300 spectrometer operating at 300 and 75.3 MHz, respectively. The spectra were acquired at room temperature (298 K) unless otherwise specified; 13 C spectra are broadband proton decoupled.…”