CR-III PHTHALOCYANINATES - SYNTHESIS, PRO PERTIES, AND CRYSTAL-STRUCTURE OF L-BIS(TRIPHENYLPHOSPHINE)IMINIUM NS-DI(NITRITO(O))PHTHALOCYANINATO(2-)CHROMATE(III)

[Cr(H2O)(2)Pc(2-)]I-x reacts with excess (PNP)NO2 in dimethylformamide to yield less soluble greenblack l-bis(triphenylphosphine)iminium -di (nitrito(O))phthalocyaninato-(2-)chromate(III), (1)(PNP)(trans)[Cr(ONO )(2)Pc(2-)], which crystallizes in the triclinic space group <P(1)over bar> (No. 2) with Z = 2. The Cr atom is in the center of the Pc(2-) l igand and the two nitrite ions are monodentate O-coordinated in a mutu ally trans arrangement to the Cr atom. The Cr-O and Cr-N-iso bond dist ances are 1.9898(14) und 1.981(2) Angstrom, respectively. The geometri c data of the coordinated nitrite ion are: d(N-O) = 1.307(2) Angstrom; d(N-O) = 1.205(2) Angstrom; not less than(O-N-O) = 113.7(2)degrees; n ot less than(Cr-O-N) = 116.85(12)degrees. The non-bonding O atoms are trans to the Cr atom. The Pc(2-) ligand is slightly saddled. Three wea k spin-allowed trip-quartet(TQ) transitions (in 10(3) cm(-1)): TQ1 (8. 20) < TQ2 (11.3) < TQ3 (20.33) and the characteristic pi-pi transitio ns of the Pc(2-) ligand: B (14.68) < Q(1) (27.1) < Q(2) (29.0) < N (35 .4) are observed in the UV-VIS-NIR spectrum. Prominent luminescence sp ectra are obtained by excitation within the TQ1 region, in which the s pin-forbidden trip-sextet transition at 7376 cm(-1) dominates at low t emperatures (T < 50 K). The vibrational spectra are discussed. In coin cidence of the excitation lines with TQ3, v(s)(Cr-O) at 378 cm(-1) is selectively resonance Raman (RR) enhanced. v(as)(Cr-O) is observed in the FIR spectrum at 391 cm(-1). The following internal vibrations (in cm(-1)) of the nitrito ligand are in the MIR spectrum: v(as)(N-O)/1447 > v(as)(N-O)/1018/1029 > delta(O-N-O)/828 and in the RR-spectrum: v(s )(N-O)/1410 > v(s)(N-O)/952, the last followed by three overtones.