Syntheses and properties of NCN-bridged tri- and tetranuclear complexes of cobalt and rhodium

Novel dinuclear nickel complexes bridged by two hydrogencyanamido (NCNH–) ligands [(NiL)2(µ2‐NHCN‐N,N′)2]2+ have been synthesized and structurally characterized. X‐ray diffraction analysis suggests that each hydrogencyanamido ligand coordinates as a cyanamide anion (N≡C–NH–) rather than a carbodiimide anion (N+=C=NH–). The structure of the central (NiNCN)2 ring skeleton varies slightly depending on the ancillary ligands, which affects strength of the Ni···Ni antiferromagnetic coupling judging from the SQUID measurements.

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Core Expansion Reactions of Cyanamido/Carbodiimido-Bridged Polynuclear Iridium Complexes

Imaji

Tanabe

Mutoh

et al. 2008

Inorg. Chem.

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Core expansion reactions of di- and tetrairidium complexes [Cp*Ir(mu(2)-NCN-N,N)](2) (1; Cp* = eta(5)-C(5)Me(5)), [Cp*Ir(mu(3)-NCN-N,N,N)](4) (2), and phosphine derivatives of 1 have been investigated, and it has been revealed that cyanamido ligands in these complexes can change their coordination modes flexibly on reactions with a second transition metal complex. Treatment of diiridium complex 1 with [Cp*IrCl(2)](2) gives the tetrairidium complex [(Cp*Ir)(2)(mu(3)-NCN-N,N,N')(2)(IrCp*Cl(2))(2)] (6) with mu(3)-kappaN,kappaN,kappaN' cyanoimido(2-) ligands. On the other hand, the reaction of 1 with [PdCl(eta(3)-C(3)H(5))](2) affords the NCN-bridged Ir(2)Pd(4) hexanuclear complex [(Cp*IrCl)(2)(mu(4)-NCN-N,N,N',N')(2){Pd(2)(mu-Cl)(eta(3)-C(3)H(5))(2)}(2)] (7) and Ir(4)Pd(4) octanuclear complex [(Cp*Ir)(4)(mu(4)-NCN-N,N,N,N')(4){PdCl(eta(3)-C(3)H(5))}(4)] (8). The NCN-bridges in 7 provide the first example of the crystallographically determined mu(4)-kappaN,kappaN,kappaN',kappaN' carbodiimido(2-) ligand. Complex 8 with mu(4)-kappaN,kappaN,kappaN,kappaN' cyanoimido(2-) ligands can also be synthesized selectively by the reaction of the parent cubane complex 2 with [PdCl(eta(3)-C(3)H(5))](2). Diphosphine derivative of 1, [{Cp*Ir(mu(2)-NCN)}(2)(mu-dppm)] (4; dppm = Ph(2)PCH(2)PPh(2)), behaves differently on reactions with [PdCl(eta(3)-C(3)H(5))](2) and [MCl(cod)](2) (cod = cycloocta-1,5-diene) to form the NCN-bridged Ir(2)M(2) (M = Pd, Rh, Ir) tetranuclear complexes [(Cp*Ir)(2)(mu(3)-NCN-N,N,N')(2){PdCl(eta(3)-C(3)H(5))}(2)(mu-dppm)] (9) and [(Cp*Ir)(2)(mu(3)-NCN-N,N,N')(2){MCl(cod)}(2)(mu-dppm)] (11a, M = Rh; 11b, M = Ir), respectively. The molecular structures for 6, 7, 8, 11a, and 11b have been determined by single-crystal X-ray analyses.

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Syntheses and properties of NCN-bridged tri- and tetranuclear complexes of cobalt and rhodium

Cited by 6 publications

References 19 publications

Supramolecular Architectures Based On Organometallic Half‐Sandwich Complexes

Supramolecular Architectures Based On Organometallic Half‐Sandwich Complexes

Dinuclear Nickel Complexes Doubly Bridged by Hydrogencyanamido Ligands: Synthesis, Structures and Magnetic Properties

Core Expansion Reactions of Cyanamido/Carbodiimido-Bridged Polynuclear Iridium Complexes

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