Premium
Bulky Hybrid C‐ Scorpionate/Amidinate Complexes of Lithium and Zinc
Author(s) -
Mandel Miles J.,
Krieck Sven,
Görls Helmar,
Westerhausen Matthias
Publication year - 2022
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202200249
Subject(s) - chemistry , lithium (medication) , zinc , medicinal chemistry , homoleptic , aqueous solution , ammonium , stereochemistry , inorganic chemistry , organic chemistry , metal , medicine , endocrinology
Lithiation of the bis(pyrazolyl)methanes H 2 C(Pz Ad,Me ) 2 ( 1 a ) and H 2 C(Pz Ph,Ph ) 2 ( 1 b ) and subsequent addition of N,N’ ‐diisopropylcarbodiimide in THF yields [(thf)Li{(Pz Ad,Me ) 2 HC−C(=N i Pr)(N i Pr)}] ( 2 a ) and [(thf)Li{(Pz Ph,Ph ) 2 HC−C(=N i Pr)(N i Pr)}] ( 2 b ). For comparison reasons, the structure of [(thf)Li{(Pz t Bu, t Bu ) 2 HC−C(=NCy)(NCy)}] ( I ) has been determined as well. Protolysis with aqueous ammonium chloride solution gives (Pz Ad,Me ) 2 HC−C(=N i Pr)(NH i Pr) ( 3 a ) and (Pz Ph,Ph ) 2 HC−C(=N i Pr)(NH i Pr) ( 3 b ). Zincation with diethylzinc leads to the formation of [EtZn{(Pz Ad,Me ) 2 HC−C(=N i Pr)(N i Pr)}] ( 4 a ) and [EtZn{(Pz Ph,Ph ) 2 HC−C(=N i Pr)(N i Pr)}] ( 4 b ). The metathetical approach allows preparation and isolation of [ClZn{(Pz Ph,Ph ) 2 HC−C(=N i Pr)(N i Pr)}] ( 5 ). A comparison of the molecular structures of the lithium and zinc complexes allows to elucidate the influence of electronegativity on structural parameters because tetra‐coordinate Li and Zn ions have very similar radii.