Coordination compounds of organotin halides with isoquinoline

Synthesis and solid-state spectroscopic investigation of some novel diorganotin(IV) complexes of tetraazamacrocyclic ligands

“…However, the positions of amide II, III and IV bands remain unchanged in the spectra of diorganotin(IV) macrocyclic complexes indicating the non-involvement of C@O group in coordination, which was further confirmed by the absence of m(Sn-O) band. Further, new bands observed in the region (470-406 cm À1 ) assignable to m(Sn-N)/(Sn N) vibrational modes in the spectra of diorganotin(IV) complexes, which are absent in the spectra of free macrocycles, confirm the coordination of azomethine nitrogen (C@N) and deprototonated amide nitrogen to tin center [33]. The m as (Sn-C) and m(Sn-C) bands in all dialkyltin(IV) complexes have been observed at 639 ± 36 and 572 ± 35 cm À1 , respectively, whereas corresponding vibrational bands in diphenyltin(IV) analogues are observed in far-IR region at 279 and 228 ± 3 cm À1 , respectively [34].…”

Exploiting Metal-Organic Coordination Polymers as Highly Efficient Immobilization Matrixes of Enzymes for Sensitive Electrochemical Biosensing

“…N-Heterocyclic thiones containing a thioamide group are intriguing ligands in coordination chemistry, which can achieve versatile coordination modes using exocyclic sulfur and endocyclic nitrogen atoms. , These ligands also show prototropic tautomerism, acid–base equilibrium, and redox reactions based on mercapto-disulfido conversion. Among N-heterocyclic thiones, 2,5-dimercapto-1,3,4-thiadiazole (DMcT, see Scheme for its chemical structure), a commonly known bismuthiol, is regarded as a particularly interesting ligand, since its donor sites (mainly two exocyclic sulfur and two endocyclic nitrogen atoms) enable coordination to two or more metal ions and thus form various MOCPs in organic solvents. − However, the coordination chemistry of DMcT to form MOCPs in aqueous solution, as we know, has not been investigated due perhaps to the limitation of the low solubility of DMcT in water.…”