Synthesis and Structure of a Thallium Complex with an Anionic Sandwich Complex Ligand

Abstract

The mechanical properties of l a are dominated by the orientation of the metal atom chains: the strongly distorted crystals-the needles are often bent-do not cleave perpendicular to [OOl], but rather separate into fibers. The appearance of the lemon-yellow, water-clear crystals gives no indication of charge delocalization along the metal atom chains. Here, the usefulness of the simplifying concept which regards carbonylmetalate (1 -) ions as large, nucleophilic pseudohalide ions becomes apparentI4'. l a is a further example of a structural relationship between carbonylmetal compounds and fluorides: polymeric structures with similar geometry have been described for MoOF, 2[6b1 (al,=cz, b l a = b 2 , cl,=2az). After [ A~C O ( C O )~]~[~I (isotypic withReceived: September 26, 1984 [Z 1012 IE] German version: Angew. Chem. 97 (1985) 59 [I] P. Klufers, Angew. Chem. 96 (1984) 288; Angew. Chem. Int. Ed. Engl. 23 (1984) 307.[Z] l a : P2,/c, Z = 16 CUCO(CO)~, a=936.9(3), b=2775.2(7), c = 1036.0 (5) pm; 8=90.40 (5)", pcsIc =2.313 g.cm-'; crystalline platelets from toluene/pentane, Mo,,(o-2/3 9) scan (Enraf-Nonius CAD4). i-h + k+l,

Triple-decker transition metal complexes bridged by a single carbocyclic ring

“…All other confirmed triple-decker sandwiches were complexes of transition metals, or were mixed transition metal/main group metal multi-decker sandwiches usually containing heterocyclic middle decks (e.g. the multi-decker [CpCo(l-1,3,4,5-tetramethyl-2,3-dihydro-1H-1,3-diboroyl)] 2 Tl) [69]. The first example of a homometallic main-group metal triple-decker complex is the trans-{(CpTl) 2 (l-g 5 :g 5 -Cp)} À anion (14), prepared from [CpTl] 1 and CpLi in the presence of 12-crown-4 in THF [70].…”