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Electronegativity and chemical hardness of organoelement groups
Author(s) -
Peregudov Alexander S.,
Kravtsov Dmitrii N.
Publication year - 2001
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 - 10.1002/1099-0739(200101)15:1<27::aid-aoc119>3.0.co;2-m
Subject(s) - electronegativity , chemistry , chemical shift , atom (system on chip) , inductive effect , group (periodic table) , crystallography , computational chemistry , organic chemistry , computer science , embedded system
The experimental approaches to estimation of comparative electronegativity and chemical hardness of organometallic groups have been proposed. Qualitative data on the electronegativity of L n M groups were obtained from 19 F NMR study of model systems 4‐FC 6 H 4 QML n (Q = CC, N(R), O, C(O)O, S), (4‐FC 6 H 4 ) 3 SnML n and (4‐FC 6 H 4 ) 3 SnQML n (Q = O, S), containing a great variety of different organometallic groups containing transition or heavy main‐group metals. The data on chemical hardness of L n M groups were obtained from NMR study of distribution of different L n M groups between hard and soft anions. The following basic results have been obtained. (1) The relative electronegativity and chemical hardness of L n M groups can change in parallel or not with the electronegativity and hardness of the central metal atom. (2) The substituents in Ar can substantially modify electronegativity and hardness of Ar n M groups; the influence of Ar groups has an inductive nature; the increase in electron‐donating ability of aryl ligands enhances the hardness of Ar n M cations. (3) The relative electronegativity and hardness of L n M groups in L n MX are invariant and do not depend on X.