Synthesis, crystal structure and in vitro antitumor activity of carboxylate bridged dinuclear organotin(IV) complexes

Morphological studies on Sn-O coordination driving self-assembly of well-defined organotin-containing block copolymers

“…2b) coordination of organotin and carboxyl group. To ascertain the block ratio, a few drops of trifluoroacetic acid were added into the NMR tube, with the purpose of destroying the self-assembly behavior by dissociating organotin from the polymer chain, based on the substitution reaction between organotin carboxylate and Bronsted acid [49][50][51][52] . As a result, the solution of block copolymer in CDCl 3 became transparent immediately and the singal of -CH 2 CH 2 CH 2 CH 3 on the organotin block appeared in 1 H-NMR.…”

“…To confirm that the self-assembly driving force comes from the coordination between tin and carboxyl group, we attempted to remove off the organotin unit from the block copolymer. Namely, the block copolymer was refluxed for 24 h in acetic acid instead of trifluoroacetic acid to avoid the possible acidolysis of PMMA block in strong acid [49][50][51][52] . White powder was obtained after precipitating reaction mixture in petroleum ether.…”

Synthesis, spectral characterizations and biological studies of transition metal mixed ligand complexes: X-ray crystal structures of [Cu(oda)(Bipy)(H2O)]·4H2O and [VO(oda)(Bipy)]·2H2O

“…The medium intensity bands appearing at 400 cm À1 and 415 cm À1 are characteristic of M-O and M-N bond(s) stretching vibrations, respectively. The strong intensity bands in 1670-1680 cm À1 and 1430-1440 cm À1 regions are due to m asym (COO À ) and m sym (COO À ) fundamental stretching vibrations, respectively [21]. The separation (Dm) between m asym (COO À ) and m sym (COO À ) stretching vibration bands [i.e., Dm = m asym (COO À )-m sym (COO À )] provides ample information for the mode of coordination of the functionalized carboxylate moieties to the metal ions [21].…”

“…The presence of additional H-bonding and/or p-p interactions between the neighbouring molecular units of the complexes quite often results in molecular assemblies particularly the metal-organic frameworks (MOFs) [19] leading to the formation of supramolecular architectures. The carboxylate groups present in different orientations in the ligand moiety provide the construction of such molecular assemblies, which may adopt a one-dimensional (1D) long chain [9,19], two-dimensional (2D) sheet [20] or three-dimensional (3D) [6,21] supramolecular networks. Furthermore, a great deal of interest has been shown in the development of therapeutic superoxide dismutase (SOD) mimics for the scavenging of superoxide free radicals ðO ÅÀ 2 Þ [22][23][24].…”

Syntheses, Characterization and Crystal Structures of 1D and 2D Organotin Polymers Containing 3-Methyladipic Acid Ligand

“…Among them, self-assembly of organotin complexes are attracting more and more attention in view of their considerable structural diversity and topologies [6][7][8][9][10][11][12]. Organotin (IV) derivatives of carboxylates are attracting considerable attention due to their biological properties such as antifungicidal and promising antitumor activity [13][14][15][16]. In recent years [17][18][19][20][21][22], a large number of organotin polymers have been reported.…”