Abstract. [(C13C)F2PNCH3]z, triclinic, P], a = 7"416 (6), b=8-377(4), c=6"308(3) A, a=109.83(4), fl= 103-37(5), ~=86.53(5) °, M=432.80, Z=I, Dx = 2.00 g cm -3. The molecule is centrosymmetric with trigonal coordination at nitrogen and trigonal-bipyramidal coordination at phosphorus. A long equatorial P-C bond of 1"888 (5) ]k and wide Neq-P-Fcq bond angle of 134.3 (2) ° are observed. Other bond lengths to phosphorus which display the expected differences between axial and equatorial coordination are P-Fax 1.602 (3), P-Fcq 1"559 (3), P-Nax 1.742 (3) and P-Neq 1"621 (3) A.
As 2 Se 5 ] 4and [As 2 Se 6 ] 2-. -The structures of the new Mn II complexes (IV) (monoclinic, P21/n, Z = 2), (VI) (triclinic, P1, Z = 1), and (VII) (P1, Z = 1) are determined by single crystal XRD. The tetradentate [As2Se4] bridging ligand in (IV) contains a central As-As bond and exhibits approximately C2h symmetry. Pairs of gauche sited Se atoms participate in five-membered As2Se2Mn chelate rings. The [As2Se5] ligands of (VI) consist of two corner-sharing AsSe 3 pyramids which are each connected to an [Mn(tren)] fragment through a single terminal Se atom. These dinuclear complexes are linked into tetranuclear moieties through weak Se···Mn interactions. In (VII) two [Mn(tren)] units are connected via two bridging [As2Se6] ligands. The [As2Se6] ligand consists of an As2Se4 ring with two terminal Se atoms. -(KROMM, A.;
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