Crystal structures of two dioxomolybdenum complexes stabilized by salan ligands featuring phenyl and cyclo-hexyl backbones

• Published in: Acta crystallographica. Section E, Crystallographic communications Crystallographic communications, 2022-02, Vol.78 (Pt 3), p.244-250
• Main Authors: Trieu-Tran, Tristhan, Martinez, Stephenie N, Brannon, Jacob P, Stieber, S Chantal E, John, Alex
• Format: Article
• Language: English
• Subjects: Research Communications
• ISSN: 2056-9890; 2056-9890
• DOI: 10.1107/S2056989022000524

Two -dioxomolybdenum complexes based on salan ligands with different backbones are reported. The first complex, dioxido{2,2'-[l,2-phenyl-enebis(imino-methyl-ene)]bis-(phenolato)}molybdenum(VI) di-methyl-formamide disolvate, [Mo(C H N O )O ]·2C H NO ( LMoO , ), features a phenyl backbone, while the second complex, (6,6'-{[(cyclo-hexane-1,2-di-yl)bis(aza-nedi-yl)]bis-(methyl-ene)}bis-(2,4-di- -butyl-phenolato))dioxidomolybdenum(VI) methanol disolvate, [Mo(C H N O )O ]·2CH OH ( LMoO , ), is based on a cyclo-hexyl backbone. These complexes crystallized as solvated species, ·2DMF and ·2MeOH. The salan ligands LH ( ) and LH ( ) coordinate to the molybdenum center in these complexes and in a κ ,κ fashion, forming a distorted octa-hedral geometry. The Mo-N and Mo-O distances are 2.3475 (16) and 1.9567 (16) Å, respectively, in while the corresponding measurements are Mo-N = 2.3412 (12) Å, and Mo-O = 1.9428 (10) Å for . A key geometrical feature is that the N-Mo-N angle of 72.40 (4)° in LMoO is slightly less than that of the LMoO angle of 75.18 (6)°, which is attributed to the flexibility of the cyclo-hexane ring between the nitro-gen as compared to the rigid phenyl ring in the LMoO .