As et of calcium and barium complexes containing the fluoroarylamide N(C 6 F 5 ) 2 À is presented.T hese compounds illustrate the key role of stabilising M···FÀCs econdary interactions in the construction of low-coordinate alkaline earth complexes. The nature of Ca···FÀCb onding in calcium complexes is examined in the light of structural data, bond valence sum (BVS) analysisa nd DFT computations. The 8 2 ), and [Ca{m-OB(CH(SiMe 3 ) 2 ) 2 }{N(C 6 F 5 ) 2 }] 2 (9 2 ), where {BDI DiPP } À and {N^N DiPP } À are the bidentate ligands CH[C(CH 3 )NDipp] 2 À and DippNC 6 H 4 CNDipp À (Dipp = 2,6-iPr 2 -C 6 H 3 ), are detailed. Com-plex 6 2 displays strongB a···FÀCc ontacts at around2 .85 . The calcium complexes feature also very short intramolecular CaÀFi nteratomic distances at around2 .50 .I na ddition, the three-coordinate complexes 7 2 and 8 2 form dinuclear structures due to intermolecular Ca···FÀCc ontacts. BVS analysis shows that Ca···FÀCi nteractions contribute to 15-20 % of the bonding pattern aroundc alcium. Computations demonstrate that Ca···FÀCb onding is mostly electrostatic, but also contains an on-negligible covalentc ontribution. They also suggest that Ca···FÀCa re the strongest amongstt he range of weak Ca···X (X = F, H, C p )s econdary interactions, due to the high positive charge of Ca 2 + which favourse lectrostatic interactions.
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