Synthesis, characterization, substitution, and atom-transfer reactions of ([eta][sup 2]-alkyne)(tetratolylporphyrinato)titanium(II). X-ray structure of trans-bis(4-picoline)(tetratolylporphyrinato)titanium(II)

Journal Article · Wed Sep 29 00:00:00 EDT 1993 · Inorganic Chemistry; (United States)

DOI:https://doi.org/10.1021/ic00072a007· OSTI ID:5089134

Woo, L K; Hays, J A; Young, Jr, V G; Day, C L ^[1]; Caron, C; D'Souza, F; Kadish, K M ^[2]

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1. Iowa State Univ., Ames, IA (United States)
2. Univ. of Houston, Houston, TX (United States)

A general preparative method for (tetratolylporphyrinato)titanium(II) [eta][sup 2]-acetylene complexes, (TTP)Ti([eta][sup 2]-RC[triple bond]CR[prime]), (R = R[prime] = CH[sub 3], CH[sub 2]CH[sub 3], C[sub 6]H[sub 5]; R = CH[sub 3], R[prime] = CH[sub 2]CH[sub 3]) is described. Displacement of 2-butyne from (TTP)Ti([eta][sup 2]-MeC[triple bond]CMe) with terminal acetylenes allows the preparation of (TTP)Ti([eta][sup 2]-HC[triple bond]CH) and (TTP)Ti([eta][sup 2]-PhC[triple bond]CH). The [pi] complexes undergo simple substitution reaction with pyridine (py) and 4-picoline (pic) to afford the bis(ligand) complexes trans-(TTP)Ti(py)[sub 2] and trans-(TTP)Ti(pic)[sub 2]. The structure of the bis(picoline) complex, C[sub 66]H[sub 56]N[sub 4]Ti, was determined by single-crystal X-ray diffraction (triclinic, P[bar 1]). Crystallographic symmetry requires that the Ti atom resides in the center of the 24 atom porphyrin plane. The Ti-N[sup pic] distance is 2.223(3) [angstrom], and the average Ti-N[sub pyrrole] distance is 2.047(8) [angstrom]. The two picoline ligands are coplanar, and the dihedral angle formed by the plane of the picoline rings and the Ti-N[sub 1] vector is 43[degrees]. When ([eta][sup 2]-PhC[triple bond]CPh)Ti(TTP) is treated with di-p-tolyldiazomethane, a diazo adduct (TTP)Ti=NN=C(C[sub 6]H[sub 4]CH[sub 3])[sub 2] is formed. Atom transfer occurs when ([eta][sup 2]-PhC[triple bond]CPh)Ti(TTP) is treated with X=PPh[sub 3] (X = S, Se), resulting in a two-electron oxidized product, (TTP)Ti=X, PPh[sub 3], and free PhC[triple bond]CPh. Treatment of (TTP)Ti([eta][sup 2]-PhC[triple bond]CPh) with elemental sulfur or selenium produces the perchalcogenido complexes (TTP)Ti(S[sub 2]) and (TTP)Ti(Se[sub 2]).

• OSTI ID: 5089134
• Journal Information: Inorganic Chemistry; (United States), Vol. 32:20; ISSN 0020-1669
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
TITANIUM COMPLEXES
CHEMICAL REACTIONS
MOLECULAR STRUCTURE
CHEMICAL PREPARATION
ORGANOMETALLIC COMPOUNDS
PORPHYRINS
TRICLINIC LATTICES
CARBOXYLIC ACIDS
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties