Alkali metal complexes having sterically bulky bis-iminopyrrolyl ligands – control of dimeric to monomeric complexes

Content Provider	Semantic Scholar
Author	Srinivas Anga Banerjee, Indrani Nayek, Hari Pada Panda, Tarun K.
Copyright Year	2016
Abstract	We report the syntheses and structural diversity of three different bis-iminopyrrole ligands and their alkali metal (Li, Na, K) complexes featuring a shift from dimeric to monomeric nature by a simple tuning of the steric control of the imine nitrogen substitutions. The bis-iminopyrrole ligands having the molecular formula [(ArNCH)2C4H2NH] [Ar = CHPh2 (1-H), Ad (2-H), Ad = adamentyl, and CPh3 (3-H)], were prepared through the reaction of 2,5-pyrrole-dicarbaldehyde with corresponding amines (ArNH2) in a 1 : 2 molar ratio and under acidic conditions. Using ligand 1-H, the lithium [{Li(Ph2CHNCH)2C4H2N}2] (1-Li), sodium [{Na(Ph2CH–NCH)2C4H2N}2(THF)] (1-Na) and potassium [{κ3-(Ph2CHNCH)2C4H2N}-K(THF)2] (1-K) complexes were obtained through either alkane elimination (for Li) or amine elimination (for Na, K). The alkali metal complexes [{κ2-(Ph3CHNCH)2C4H2N}M(THF)n] [n = 2, M = Li (3-Li), Na (3-Na); n = 3, M = K (3-K)] were synthesized using the ligand 3-H. Molecular structures of ligands 1-3-H, and alkali metal complexes 1-Li, 1-Na, 1-K, 3-Li, 3-Na and 3-K, in the solid state were established. The complexes 1-Li and 1-Na were found to be dimeric in the solid state whereas the complexes 1-K, 3-Li, 3-Na and 3-K were all monomeric – either due to a larger ionic radius (for 1-K) or because of the presence of the bulky triphenylmethyl group on the imine nitrogen.
Starting Page	80916
Ending Page	80923
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1039/C6RA13437H
Volume Number	6
Alternate Webpage(s)	http://raiith.iith.ac.in/2672/1/2672_amanu.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C6RA13437H
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article