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Structure–reactivity studies of chloro and isothiocyanato diorganotin (IV) complexes based on multidentate N‐donor ligands: Synthesis, spectral characterization and crystal structures
Author(s) -
Momeni Badri Z.,
Sefidabi Farzaneh,
Khademi Saghi,
Fathi Nastaran
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4432
Subject(s) - chemistry , denticity , ligand (biochemistry) , crystal structure , reactivity (psychology) , tin , crystallography , stereochemistry , nuclear magnetic resonance spectroscopy , medicinal chemistry , ionic bonding , ion , organic chemistry , medicine , biochemistry , receptor , alternative medicine , pathology
The reaction of [SnMe 2 Cl 2 ] with the bidentate ligand 4,7‐phenanthroline (4,7‐phen) resulted in the formation of [SnMe 2 Cl 2 (4,7‐phen)] n ( 1a ) which is probably a polymeric chain in solution. On the other hand, the reaction of [SnEt 2 Cl 2 ] with 4,7‐phen afforded the complex [Sn 2 Et 4 Cl 4 (κ 1 ‐N‐4,7‐phen) 2 (μ‐κ 2 ‐N,N‐4,7‐phen)] ( 1b ) which dissociates in dimethylsulfoxide solution. The reaction of [SnR 2 Cl 2 ] (R = Me, Et) with 2,2′‐biquinoline (biq) yielded the complexes [SnMe 2 Cl 2 (κ 2 ‐N,N‐biq)] ( 2a ) and [SnEt 2 Cl 2 (κ 1 ‐N‐biq) 2 ] ( 2b ) in the solid state. Moreover, the reaction of [SnR 2 Cl 2 ] (R = Me, Et) with the tridentate ligand 4′‐(2‐furyl)‐2,2′:6′,2″‐terpyridine (ftpy) resulted in the formation of ionic penta‐ and hexa‐coordinated tin complexes [SnMe 2 Cl (ftpy)][SnMe 2 Cl 3 ] ( 3a ) and [SnEt 2 Cl (ftpy)]Cl ( 3b ). The reaction of [SnMe 2 (NCS) 2 ] with ftpy afforded the hepta‐coordinated complex [SnMe 2 (NCS) 2 (ftpy)] ( 4a ). The products were fully characterized using elemental analysis, and infrared, UV–visible, multinuclear ( 1 H, 13 C, 119 Sn) NMR, DEPT‐135°, HH‐COSY and HSQC NMR spectroscopies. The crystal structure of complex 3a reveals that it contains the simultaneous presence of penta‐ and hexa‐coordinated tin (IV) atoms. Notably, the crystal structure of complex 4a shows that tin (IV) is hepta‐coordinated in a pentagonal bipyramidal geometry SnC 2 N 5 by three nitrogen atoms of ftpy, two nitrogen atoms of NCS − and two Me groups with trans ‐[SnMe 2 ] configuration. These data indicate the influence of halide or pseudo‐halide group on the coordination number and geometry of tin. Hirshfeld surface analysis and two‐dimensional fingerprint plots were calculated for 3a and 4a which show the π–π interaction between molecules in the solid is relatively weak.