Synthesis of cyclooctatetraenyleuropium and cyclooctatetraenylytterbium

Advances in f element reductive reactivity as a paradigm for expanding lanthanide and actinide science and technology

“…Eqs. (20) and (21) show that (C 5 Me 5 ) 3 Sm reduces azobenzene [77] to the same product obtained by the reaction of one equivalent of (C 5 Me 5 ) 2 Sm with azobenzene [42].…”

“…Bis(cyclopentadienyl) complexes of divalent Eu and Yb were synthesized by Fischer and Fischer [14] and the THF-insoluble samarium analog was later reported by Watt and Gillow [15]. Streitwieser's synthesis of uranocene, (C 8 H 8 ) 2 U, in 1968 [16] stimulated the field and cyclooctatetraenyl complexes of both trivalent [17][18][19] and divalent [20] lanthanides were subsequently reported. The only crystal structure of an organolanthanide with a Ln C single bond was that of the aryl "ate" salt, [Lu(2,6-Me 2 C 6 H 3 ) 4 ][Li(THF) 4 ], which was reported in 1972 [21].…”

Lutetium complexes with tetraphenylethylene dianion. Synthesis and structure

“…The use of polyanionic ligands in organolanthanide chemistry has started from the discovery of cyclooctatetraene derivatives. 1b, 4 Another example of the use of dianionic ligands is the synthesis of complexes with carborane dianions. 5 Compounds with the dianions of naphthalene, 6 anthracene, 7 other aromatic hydrocarbons, and their heteroatomic analogs, 7c,8 the pyrene trianion, and the benzene dianion 9 are known.…”

Divalent lanthanide chemistry. Bis (pentamethylcyclopentadienyl) europium(II) and -ytterbium(II) derivatives: crystal structure of bis (pentamethylcyclopentadienyl) (tetrahydrofuran ytterbium(II) -hemitoluene at 176 K

“…6798 ( 7) .7042 (3) .0842 ( 7) C (2) .6761 (7) ,7487(3) '1800(7) C (3) .5646 (6) .7425 (3) 0 2186 ( 7) C (4) .4987 ( 7) .6941 (3) .1460(8) C (5) .5690 (7) .6696 (3) .0648(7) C (6) .7800 (9) .6958 (4) .0100(9) C (7) '7678 (9) .7977 (4) .230(1) C (8) .5228 (9) .7833 (4) .3187(9) C (9) .3702 (8) .6773 (4) .145(1) C (10) 0 5317 ( 9) .6187 (4) ~-.0330 (9) c ( 11) '5689 (7) '5485 ( 3) .3764 (7) c ( 12) .5574 (6) .5975 (3) .4573 (8) c ( 13) .6705 (8) .6105 (4) .5355 (7) c ( 14) '7541 ( 7) .5678(4) 0 5021 ( 7) C (15) . 6907 ( 7) .5303 (3) .4034 (8) c ( 16) .4690 (9) .5162 …”

“…343 (1) c ( 21) .9948 (8) .6869(5) '392 (1) C (22) 1.112 (1) .6661 (8) .369(2) C (23) 1. 092 (1) .6210 (6) .262(2) C (24) '9642 (7) .6009 (4) .254 (1) c ( 25) .0195 (9) .4595 (5) .077(1) C(26)…”