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Generation and Reactivity of Polychalcogenide Chains in Binuclear Cobalt(II) Complexes.
Hossain, Kamal; Roy Choudhury, Angshuman; Majumdar, Amit.
Affiliation
  • Hossain K; School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India.
  • Roy Choudhury A; Department of Chemical Sciences, Indian Institute of Science Education and Research, Mohali, Knowledge City, Sector 81, S. A. S. Nagar, Manauli P.O., Mohali, Punjab 140306, India.
  • Majumdar A; School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India.
JACS Au ; 4(2): 771-787, 2024 Feb 26.
Article in En | MEDLINE | ID: mdl-38425921
ABSTRACT
A series of six binuclear Co(II)-thiolate complexes, [Co2(BPMP)(S-C6H4-o-X)2]1+ (X = OMe, 2; NH2, 3), [Co2(BPMP)(µ-S-C6H4-o-O)]1+ (4), and [Co2(BPMP)(µ-Y)]1+ (Y = bdt, 5; tdt, 6; mnt, 7), has been synthesized from [Co2(BPMP)(MeOH)2(Cl)2]1+ (1a) and [Co2(BPMP)(Cl)2]1+ (1b), where BPMP1- is the anion of 2,6-bis[[bis(2-pyridylmethyl)amino]methyl]-4-methylphenol. While 2 and 3 could allow the two-electron redox reaction of the two coordinated thiolates with elemental sulfur (S8) to generate [Co2(BPMP)(µ-S5)]1+ (8), the complexes, 4-7, could not undergo a similar reaction. An analogous redox reaction of 2 with elemental selenium ([Se]) produced [{Co2(BPMP)(µ-Se4)}{Co2(BPMP)(µ-Se3)}]2+ (9a) and [Co2(BPMP)(µ-Se4)]1+ (9b). Further reaction of these polychalcogenido complexes, 8 and 9a/9b, with PPh3 allowed the isolation of [Co2(BPMP)(µ-S)]1+ (10) and [Co2(BPMP)(µ-Se2)]1+ (11), which, in turn, could be converted back to 8 and 9a upon treatment with S8 and [Se], respectively. Interestingly, while the redox reaction of the polyselenide chains in 9a and 11 with S8 produced 8 and [Se], the treatment of 8 with [Se] gave back only the starting material (8), thus demonstrating the different redox behavior of sulfur and selenium. Furthermore, the reaction of 8 and 9a/9b with activated alkynes and cyanide (CN-) allowed the isolation of the complexes, [Co2(BPMP)(µ-E2C2(CO2R)2)]1+ (E = S 12a, R = Me; 12b, R = Et; E = Se 13a, R = Me; 13b, R = Et) and [Co2(BPMP)(µ-SH)(NCS)2] (14), respectively. The present work, thus, provides an interesting synthetic strategy, interconversions, and detailed comparative reactivity of binuclear Co(II)-polychalcogenido complexes.

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: JACS Au Year: 2024 Document type: Article Affiliation country: India Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: JACS Au Year: 2024 Document type: Article Affiliation country: India Country of publication: United States