121Sb-M��bauer-Spektren. IV. Benzamidinkomplexe des Antimon(V) Die Kristallstruktur von [Ph2Cl2Sb(N2Me2CPh)]

Synthesis and characterization of a range of antimony(I/III) N,N'-bis(2,6-diisopropylphenyl)formamidinate complexes

Formamidinatoantimony(I/III) complexes have been successfully synthesized as monomers or dimers in the solid state featuring a variety of coordination geometries and have also been comprehensively characterized. The antimony(I) formamidinate complex bis[μ-N,N'-bis(2,6-diisopropylphenyl)formamidinato]diantimony(I)(2 Sb-Sb) tetrahydrofuran heptasolvate, [Sb₂(C₂₅H₃₅N₂)₂]·7C₄H₈O or [Sb₂(DippForm)₂]·7THF, (1), was obtained by a metathesis reaction between sodium bis(trimethylsilyl)amide [NaN(SiMe₃)₂] and N,N'-bis(2,6-diisopropylphenyl)formamidine (DippFormH), followed by SbCl₃. A range of trivalent haloformamidinatoantimony(III) complexes, namely, bis[N,N'-bis(2,6-diisopropylphenyl)formamidinato]chloridoantimony(III), [Sb(C₂₅H₃₅N₂)₂Cl] or [Sb(DippForm)₂Cl], (2), bis[N,N'-bis(2,6-diisopropylphenyl)formamidinato]bromidoantimony(III), [SbBr(C₂₅H₃₅N₂)₂] or [SbBr(DippForm)₂], (3), bis[N,N'-bis(2,6-diisopropylphenyl)formamidinato]iodidoantimony(III), [Sb(C₂₅H₃₅N₂)₂I] or [Sb(DippForm)₂I], (4), [N,N'-bis(2,6-diisopropylphenyl)formamidinato]dibromidoantimony(III), [SbBr₂(C₂₅H₃₅N₂)] or [SbBr₂(DippForm)], (5), and [N,N'-bis(2,6-diisopropylphenyl)formamidinato]diiodidoantimony(III), [Sb(C₂₅H₃₅N₂)I₂] or [Sb(DippForm)I₂], (6), were also synthesized by adding DippFormH and MN(SiMe₃)₂ (M = Li or Na) to the corresponding antimony halides SbX₃ (X = Cl, Br or I) in differing ratios. The complexes were all stable to rearrangement.

Tetrachloromethane as halogen bond donor toward metal-bound halides

Two annulated triazapentadiene systems, viz. 1,3,5,7,9-pentaazanona-1,3,6,8-tetraenate chloride complexes of PtII, form CCl4 solvates, containing the Cl3C–Cl···Cl–Pt halogen bonds. These halogen bonds are firstly reported type of Cl3C–Cl···Cl–M contacts. In the X-ray structures of two solvates different non-covalent interactions were detected and studied by DFT calculations and topological analysis of the electron density distribution within the framework of QTAIM method at the M06/DZP-DKH level of theory. Estimated energies of these supramolecular contacts vary from 0.6 to 2.4 kcal/mol.