{CpFeII(CO)2SnII(Macrocycle•3-)} Radicals with Intrinsic Charge Transfer from CpFe(CO)2 to Macrocycles (Cp: Cp or Cp*); Effective Magnetic Coupling between Radical Trianionic Macrocycles•3

Bimetallic neutral and anionic complexes of transition metal (Co, Mn) carbonyls with indium(III) phthalocyanine

Heterobimetallic {[Co(CO)4]-[InIII(Pc2-)]} (1) and (Cp*2Cr+){[Mn(CO)5]-[InIII(Pc˙3-)]}·2C6H4Cl2 (2) complexes based on indium(III) phthalocyanine (Pc) were obtained as crystals. The complexes were synthesized by single (1) and double (2) reduction of indium(III) phthalocyanine chloride in the presence of transition metal carbonyls. Complex 1 contains dianionic Pc2- macrocycles. Thus, the coordinated Co(CO)4 carbonyl accepts an electron in the one-electron reduction forming a diamagnetic [Co(CO)4]- anion. Complex 2 contains a heterobimetallic {[Mn(CO)5]-[InIII(Pc˙3-)]}- anion and paramagnetic Cp*2Cr+ counter cations. Therefore, in the double reduction, electrons are transferred to Mn(CO)5 forming a diamagnetic [Mn(CO)5]- anion and to the Pc2- macrocycle forming a paramagnetic radical Pc˙3- trianion. Such assignments for 1 and 2 are in line with optical spectra, crystal structures and the data of magnetic measurements. The spectrum of 1 in the UV-visible range is similar to that of the starting InIIIClPc. The formation of 2 is accompanied by an essential blue-shift of the Q-band of Pc as well as by the appearance of an intense NIR band at 1005 nm characteristic of Pc˙3-. Compound 1 is EPR silent and diamagnetic, whereas the value of the effective magnetic moment of 2 is 4.24μB at 300 K, which corresponds to the contribution of S = 1/2 (Pc˙3-) and S = 3/2 (Cp*2Cr+) spins. Both weakly coupled paramagnetic centers (J = -0.41 cm-1) are observed in the EPR spectra.

Trinuclear coordination assemblies of low-spin dicyano manganese(II) (S = 1/2) and iron(II) (S = 0) phthalocyanines with manganese(II) acetylacetonate, tris(cyclopentadienyl)gadolinium(III) and neodymium(III)

The reaction of Mn^IIPc, Fe^IIPc or Fe^IIPcCl₁₆ with KCN in the presence of cryptand[2.2.2] yielded dicyano-complexes {cryptand(K⁺)}₂{M^II(CN)₂(macrocycle^2-)}^2-·XC₆H₄Cl₂ (M = Mn and Fe, X = 1 and 2) that were used for the preparation of trinuclear assemblies of the general formula {cryptand(K⁺)}₂{M^II(CN)₂Pc·(ML)₂}^2-·nC₆H₄Cl₂ (M^II = Mn^II and Fe^II; n = 1, 4 and 5). These assemblies were formed via coordination of two manganese(II) acetylacetonate (ML = Mn^II(acac)₂, S = 5/2), tris(cyclopentadienyl)gadolinium (ML = Cp₃Gd^III, S = 7/2) or tris(cyclopentadienyl)neodymium (ML = Cp₃Nd^III, S = 3/2) units to the nitrogen atoms of bidentate cyano ligands. The N(CN)-Mn{Mn^II(acac)₂} bond is 2.129(3) Å long but the bonds are elongated to 2.43-2.49 Å for tris(cyclopentadienyl)lanthanides. {Cryptand(K⁺)}₂{Mn^II(CN)₂Pc·(Mn^II(acac)₂)₂}^2-·5C₆H₄Cl₂ (2) contains three Mn(II) ions in different spin states (S = 5/2 and 1/2). Strong antiferromagnetic coupling of spins observed between them with the exchange interaction (J) of -17.6 cm^-1 enables the formation of a high S = 9/2 spin state for {Mn^II(CN)₂Pc·(Mn^II(acac)₂)₂}^2- dianions at 2 K. The estimated exchange interaction between Mn^II (S = 1/2) and Gd^III (S = 7/2) spins in {Mn^II(CN)₂Pc·(Cp₃Gd^III)₂}^2- is only -1.1 cm^-1, and in contrast to 2, nearly independent Gd^III and Mn^II centers are formed. As a result, no transition to the high-spin state is observed in {Mn^II(CN)₂Pc·(Cp₃Gd^III)₂}^2-. The {Mn^II(CN)₂Pc·(Cp₃Nd^III)₂}^2- and{Fe^II(CN)₂Pc·(Cp₃Nd^III)₂}^2- dianions with Cp₃Nd^III show a decrease of χ_MT values in the whole studied temperature range (300-1.9 K). A similar behaviour was found previously for pristine Cp₃Nd^III and Cp₃Nd^III·L complexes (L = alkylisocyanide ligand).

Complexes of transition metal carbonyl clusters with tin(II) phthalocyanine in neutral and radical anion states: methods of synthesis, structures and properties

Coordination of tin(II) phthalocyanine to transition metal carbonyl clusters in neutral {Sn^II(Pc^2-)}⁰ or radical anion {Sn^II(Pc˙^3-)}^- states is reported. Direct interaction of Co₄(CO)₁₂ with {Sn^II(Pc^2-)}⁰ yields a crystalline complex {Co₄(CO)₁₁·Sn^II(Pc^2-)} (1). There is no charge transfer from the cluster to phthalocyanine in 1, which preserves the diamagnetic Pc^2- macrocycle. The Ru₃(CO)₁₂ cluster forms complexes with one or two equivalents of {Sn^II(Pc˙^3-)}^- to yield crystalline {Cryptand[2.2.2](Na⁺)}{Ru₃(CO)₁₁·Sn^II(Pc˙^3-)}^- (2) or {Cryptand[2.2.2](M⁺)}₂{Ru₃(CO)₁₀·[Sn^II(Pc˙^3-)]₂}^2-·4C₆H₄Cl₂ (3) (M⁺ is K or Cs). Paramagnetic {Sn^II(Pc˙^3-)}^- species in 2 are packed in π-stacking [{Sn^II(Pc˙^3-)}^-]₂ dimers, providing strong antiferromagnetic coupling of spins with exchange interaction J/k_B = -19 K. Reduction of Ru₃(CO)₁₂, Os₃(CO)₁₂ and Ir₄(CO)₁₂ clusters by decamethylchromocene (Cp*₂Cr) and subsequent oxidation of the reduced species by {Sn^IVCl₂(Pc^2-)}⁰ yield a series of complexes with high-spin Cp*₂Cr⁺ counter cations (S = 3/2): (Cp*₂Cr⁺){Ru₃(CO)₁₁·Sn^II(Pc˙^3-)}^-·C₆H₄Cl₂ (4), (Cp*₂Cr⁺){Os₃(CO)₁₀Cl·Sn^II(Pc˙^3-)}^-·C₆H₄Cl₂ (5) and (Cp*₂Cr⁺){Ir₄(CO)₁₁·Sn^II(Pc˙^3-)}₂^- (6). It is seen that reduced clusters are oxidized by Sn^IV, which is transferred to Sn^II, whereas the Pc^2- macrocycle is reduced to Pc˙^3-. In the case of Os₃(CO)₁₂, oxidation of the metal atom in the cluster is observed to be accompanied by the formation of Os₃(CO)₁₀Cl with one Os^I center. Rather weak magnetic coupling is observed between paramagnetic Cp*₂Cr⁺ and {Sn^II(Pc˙^3-)}^- species in 4, but this exchange interaction is enhanced in 5 owing to Os₃(CO)₁₀Cl clusters with paramagnetic Os^I (S = 1/2) also being involved in antiferromagnetic coupling of spins. The formation of {Sn^II(Pc˙^3-)}^- with radical trianion Pc˙^3- macrocycles in 2-5 is supported by the appearance of new absorption bands in the NIR spectra and essential N_meso-C bond alternation in Pc (for 3-5). On the whole, this work shows that both diamagnetic {Sn^II(Pc^2-)}⁰ and paramagnetic {Sn^II(Pc˙^3-)}^- ligands substitute carbonyl ligands in the transition metal carbonyl clusters, forming well-soluble paramagnetic solids absorbing light in the visible and NIR ranges.

Interaction of InIIIClPc and TlIIIClPc phthalocyanines with deprotonated porphyrin HTPP− anions. Metal-centred reduction of TlIIIClPc

Reactions of In[Formula: see text]ClPc or Tl[Formula: see text]ClPc phthalocyanines with monodeprotonated tetraphenylporphyrin HTPP[Formula: see text] anions have been studied under reduction or in the presence of [Formula: see text]-methylimidazole ([Formula: see text]-MeIm). Formation of salt {In[Formula: see text]-MeIm)2(TPP[Formula: see text]}[Formula: see text]{In[Formula: see text](Pc[Formula: see text]}[Formula: see text] ⋅ 4C6H4Cl2 (1) justifies partial abstraction of indium(III) atoms from In[Formula: see text]ClPc to form cationic {In[Formula: see text](TPP[Formula: see text]}[Formula: see text] porphyrins[Formula: see text]solvated by [Formula: see text]-MeIm and double-decker {In[Formula: see text](Pc[Formula: see text]}[Formula: see text] anions. Crystals of Tl[Formula: see text](HTPP[Formula: see text] (2) have been only obtained at the interaction of HTPP[Formula: see text] with Tl[Formula: see text]ClPc under reduction indicating that Tl[Formula: see text] is reduced to Tl[Formula: see text] and is abstracted by HTPP[Formula: see text]. To confirm the possibility of Tl[Formula: see text] formation under reduction we have studied reduction of Tl[Formula: see text]ClPc by sodium fluorenone in the presence of cryptand[2.2.2]. Crystals of {Cryptand(Na[Formula: see text]}(Tl[Formula: see text](Pc[Formula: see text]}[Formula: see text] ⋅ C6H4Cl2(3) have been isolated indicating metal-centered reduction of Tl[Formula: see text]ClPc to form Tl[Formula: see text] and preserving dianionic Pc[Formula: see text] macrocycles. Optical spectra and structures of the obtained compounds are discussed and compared with those of pristine M[Formula: see text]ClPc. It is shown that 1–3 are EPR silent due to the formation of diamagnetic components.

Cleavage of the C-H Bond in Bu3MeP+ by Zinc Porphyrin Dianions: Formation of {ZnII(CH2PBu3)(TPyPH)}- Containing Zn-C(ylide) Bond and the (TPyPH)3- Macrocycle Showing Strong NIR Absorption

Reduction of {Zn^II(TPyP)} to the {Zn^II(TPyP)}^2- dianions (TPyP: tetra(4-pyridyl)porphyrin) in the presence of Bu₃MeP⁺ allows one to observe the C-H bond cleavage in the methyl group of Bu₃MeP⁺ to form (Bu₃MeP⁺){Zn^II(CH₂PBu₃)(TPyPH)}^-·0.337C₆H₅CH₃ (1). Salt 1 is the first coordination complex of neutral CH₂PBu₃ ylide and metalloporphyrin. The released hydrogen atom attacks the meso-carbon atom of TPyP^4- forming a TPyPH^3- macrocycle related to phlorins. Decreased symmetry of the TPyPH^3- allows the observation of a strong NIR absorption. We discuss the molecular structure, optical, and magnetic properties of 1 together with its formation pathways.

Coordination-induced metal-to-macrocycle charge transfer and effect of cations on reorientation of the CN ligand in the {SnL2Mac}2− dianions (L = CN−, OCN−, Im−; Mac = phthalo- or naphthalocyanine)

Anionic coordination {crypt(M⁺)}₂{SnL₂Mac}²⁻ complexes of tin(ii) phthalo- (Pc) and naphthalocyanines (Nc) were obtained and discussed.