Synthesis and crystal structures of nickel(ii) and palladium(ii) complexes with o-carboranyl amidine ligands

Abstract

A number of new nido-carboranyl amidines 10-R(CH2)nNHC(Et)=HN-7,8-C2B9H11 (n = 2, R = OH, OMe, NMe2; n = 3, R = OH) were synthesized by nucleophilic addition of amino alcohols and...

Fluorene-decorated Ir(iii) complexes: synthesis, photophysics and tunable triplet excited state properties in aggregation

“…When complexes Ir1 or Ir2 aggregate, the long alkyl chain introduced into the Ir1 and Ir2 will hinder phosphorescence quenching, which is a result of π-π stacking. Moreover, the introduction of fluorene groups would restrict the intramolecular rotation, 46,47 which will lead to an enhancement of the radiative process and a decrement of the non-radiative process.…”

(7,8-Dicarba-nido-undecaboran-7-yl)acetic acid: synthesis of individual enantiomers and the first example of the determination of the absolute configuration of chiral monosubstituted nido-carborane

“…19 Thus, the propionitrile addition to nido -carborane in the presence of mercury( ii ) chloride was used to obtain 10-amino- nido -carborane and its derivatives. 19 d ,20…”

Synthesis of Boronated Amidines by Addition of Amines to Nitrilium Derivative of Cobalt Bis(Dicarbollide)

“…Synthesis of boronated amidines by the reaction of nucleophilic addition of amines to alkylnitrilium derivatives was first described for arachno-decaborate [72] and closo-decaborate [40,41,[73][74][75][76] anions. Later, amidines on the base of nido-carborane [77][78][79] and the closo-dodecaborate anion [80] were synthesized. The reactions of [(8-RC≡N-3,3 -Co(1,2-C 2 B 9 H 10 )(1 ,2 -C 2 B 9 H 11 ] (R = Me, Ph) with n-butylamine and diethylamine resulting in the corresponding amidines were reported as well [49].…”

“…Although the formation of mixtures of the E and Z isomers for organic amidines is well known [82], the presence of E-and Z-isomers in solutions of boronated amidines prepared by addition of primary amines to nitrilium derivatives of polyhedral boron hydrides was reported only for the nido-decaborane [72] and nido-carborane [77,79] based amidines. This could be an indication that for the other boronated amidines only one isomer is present in solution, or that the interconversion between the E-and Z-isomers is fast on the NMR time scale.…”