Diferrocenophosphaborin: A Planar‐Chiral, Redox‐Active and Anion‐Responsive Ambiphilic Ligand

Abstract

An ew class of Janus-like ambiphilic ligands is introduced. The rigid diferrocene backbone in heterocycles 4-SnP and 4-BP creates an unprecedented chiral environment as demonstrated by multinuclear NMR and single-crystal X-ray studies.I na ddition, the ligands are redox-responsive and the Lewis acidic borane moiety in 4-BP can be exploited to further tune the properties:aclear decrease in the CO stretching frequency of aV aska-type Rh I complex 5-BP is observed upon addition of fluoride ions.Thus,the Lewis acid and Lewis base sites influence each other and their strength can be modulated by redox chemistry and anion binding.

A sterically congested 1,2-diphosphino-1′-boryl-ferrocene: synthesis, characterization and coordination to platinum

“…Hydrogen atoms and dichloromethane molecules omitted for clarity. Selected bond length (Å) and angles, torsions (°): Fe-Ct1 = 1.670(3); Fe-Ct2 = 1.689(3); P1-C1 = 85 1.802(6); P2-C2 = 1.783(6); B-C6=1.562(9); P1-Pt = 2.2185(15) ; P2-Pt = 2.2406(15) ; Pt-Cl1 = 2.3587(15); Pt-Cl2 = 2.3387(14); Ct1-Fe-Ct2 = 177.71(14); P1-C1-Ct1 = 170.6(5); P2-C2-Ct1 = 168.8(5); B-C6-Ct2 = 155.9(6); Cl2-Pt-Cl1 = 88.60(5); Cl1-Pt-P1 = 92.41(5); P1-Pt-P2 = 85.47(5); P2-Pt-Cl2 = 93.21(5); P1-Ct1-Ct2-B = -132.64(18); P2-Ct1-90 Ct2-B = -72.14(18); B … P1 = 6.555(7); B … P2 = 5.294(7).…”