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Synthesis, Structure and Chemistry of Mono‐ and Digallane Complexes Supported by N,O ‐Ketimine Ligand
Author(s) -
Bakthavachalam Kirubakaran,
Yuvaraj Kuppusamy,
Raghavendra Beesam,
Dorcet Vincent,
Roisnel Thierry,
Rit Arnab,
Ghosh Sundargopal
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701634
Subject(s) - gallium , chemistry , ligand (biochemistry) , adduct , crystal structure , medicinal chemistry , alkyl , crystallography , chloride , stereochemistry , organic chemistry , biochemistry , receptor
A series of N,O ‐ketimine supported gallium and digallane complexes have been synthesized and structurally characterized. The mono(ketiminate) gallium dichloride [OCMeCHCMeN(Dipp)]GaCl 2 , 2 (Dipp=2,6‐ i Pr 2 C 6 H 3 ) and bis(ketiminate) gallium chloride [OCMeCHCMeN(Dipp)] 2 GaCl, 3 were isolated from the reaction of GaCl 3 with 1 and 2 equivalents of lithiated ketimine, [OCMeCHCMeN(Dipp)]Li, 1 respectively. Treatment of 1 with ‘‘GaI’’ yielded diiodobis(ketiminate) digallane complex [OCMeCHCMeN‐(Dipp)] 2 Ga 2 I 2, 4 . To the best of our knowledge, compound 4 is the first report on N,O ‐ketiminate ligand supported stable heteroleptic digallane(II) complex. The frontier molecular orbital analysis and a high Wiberg Bond Index (WBI) values support the strong interaction between the gallium centers in 4 . In an attempt to synthesize alkyl substituted Ga complexes, we carried out the reaction of ketimine ligand with Ga t Bu 2 Cl (1:1 ratio) that generated the adduct [OCMeCHCMeN(H)(Dipp)]Ga t Bu 2 Cl, 5 . In a similar fashion, dialkyl gallium complex [OCMeCHCMeN(Dipp)]Ga t Bu 2 , 6 was obtained from the reaction of 1 with Ga t Bu 2 Cl. All the compounds have been charecterized by 1 H, 13 C NMR and mass spectroscopy. The molecular structures of complexes 2–5 have also been determined by single crystal X‐ray diffraction analysis.