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Synthesis and Structure of Unprecedented Samarium Complex with Bulky Bis‐iminopyrrolyl Ligand via Intramolecular C=N Bond Activation
Author(s) -
Das Suman,
Anga Srinivas,
Harinath Adimulam,
Pada Nayek Hari,
Panda Tarun K.
Publication year - 2017
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201700354
Subject(s) - samarium , homoleptic , chemistry , ligand (biochemistry) , imine , intramolecular force , crystal structure , moiety , medicinal chemistry , crystallography , stereochemistry , metal , inorganic chemistry , organic chemistry , catalysis , biochemistry , receptor
An unprecedentate samarium complex of the molecular composition [{ κ 3 ‐{(Ph 2 CH)N=CH} 2 C 4 H 2 N)}{ κ 3 ‐{(Ph 2 CHN=CH)(Ph 2 CHNCH)C 4 H 2 N}Sm} 2 ] ( 2 ), which was isolated by the reaction of a potassium salt of 2,5‐bis{ N ‐(diphenylmethyl)‐iminomethyl}pyrrolyl ligand [K(THF) 2 {(Ph 2 CH)N=CH} 2 C 4 H 2 N)] ( 1 ) with anhydrous samarium diiodide in THF at 60 °C through the in situ reduction of imine bond is presented. The homoleptic samarium complex [[ κ 3 ‐{(Ph 2 CH)–N=CH} 2 C 4 H 2 N)] 3 Sm] ( 3 ) can also be obtained from the reaction of compound 1 with anhydrous samarium triiodide (SmI 3 ) in THF at 60 °C. The molecular structures of complexes 2 and 3 were established by single‐crystal X‐ray diffraction analysis. The molecular structure of complex 2 reveals the formation of a C–C bond in the 2,5‐bis{ N ‐(diphenylmethyl)iminomethyl}pyrrole ligand moiety (Ph 2 Py – ). However, complex 3 is a homoleptic samarium complex of three bis‐iminopyrrolyl ligands. In complex 2 , the samarium ion adopts an octahedral arrangement, whereas in complex 3 , a distorted three face‐centered trigonal prismatic mode of nine coordination is observed around the metal ion.