Preparation and properties of phthalocyaninato(2-)indates(III) with bidentate oxo ligands; Crystal structure of tetra(n-butyl)ammonium carbonato(O, O′)phthalocyaninato(2-)indate(III)

Article abstract of DOI:10.1002/zaac.199762301152

Tetra(n-butyl)ammonium acidophthalocyaninato(2-)indate(III) of selected bidentate dioxo ligands (oxalate, catecholate, sulfate and carbonate) are obtained by the reaction of tetra(n-butyl)ammonium cis-dihydroxophthalocyaninato(2-)indate(III) with oxalic acid, catechol, hydrogensulfate and ammonium carbaminate. The carbonate complex crystallizes monoclinic in the space group P2₁/c (No. 14). In^III is hexa-coordinated by four isoindole nitrogen atoms (N_iso) and two oxygen atoms of the carbonate in a cis arrangement. In^III is directed out of the centre (Ct) of the (N_iso)₄ plane towards the carbonate ligand (d(In-Ct) = 0.903(1) A?. The averaged (In-N_iso) and (In-O) distance is 2.1865(4) and 2.1585(5) A?, the (O-In-O′) angle 60.1(2)°. The phthalocyaninate(2-) ligand (pc^2-) is in a concave distortion. The optical spectra show the typical π-π* transition of the pc^2- ligand at 14600 (B region), 28000 (Q), 35000 (N) und 40500 cm^-1 (L). In the IR spectra, the internal vibrations of the oxalate, sulfate and carbonate ligand and the asymmetric (In-O) stretching vibrations are well separated from the internal vibrations of the pc^2- skeleton. Spectra-structure correlations are discussed.