| Popis: |
New linear and tripodal tetradentate ligands, LH 2 , are reported and their syntheses are described. The new linear ligands L = HSCH 2 CH 2 SCH 2 CH 2 NRCH 2 CR 2 SH, R = H, CH 3 ) and the new tripodal ligands N(CH 2 CH 2 SH) 2 CH 2 Z, Z = CH 2 NH 2 , CH 2 N(CH 3 ) 2 , CH 2 N(C 2 H 5 ) 2 , CH 2 SCH 3 and CO 2 - were synthesized. The known linear ligands HSCH 2 CH 2 NCH 3 (CH 2 ) n NCH 3 CH 2 CH 2 SH (n = 2, 3) and HSCR 2 CH 2 NHCH 2 CH 2 NHCH 2 CR 2 SH (R = H, CH 3 ) were also utilized. These ligands react with MoO 2 (acac) 2 in CH 3 OH to yield MoO 2 L complexes in high yield. Infra-red and 1 H nmr spectra provide evidence to supplement X-ray crystallographic results reported elsewhere for selected numbers of the series. Octahedral structures with cis MoO 2 2+ groupings are assigned. Solution 1 H nmr studies are consistent with a trans placement of the two thiolate donors in agreement with the X-ray studies. |
