dedtc ϭ diethyldithiocarbamate, 4-MP ϭ tri(4-methylphenyl)phosphine, PPh 3 ϭ triphenylphophine) are reported. IR spectra of complexes 1-4 show the characteristic thioureide (C-N) bands at higher wave numbers compared to that of the parent dithiocarbamate complex [Ni(dedtc) 2 ]. The d-d transitions are observed in the region 452Ϫ482 nm. Synthese, Spektroskopie, Cyclovoltammetrie und Einkristall-Strukturanalysen von planaren NiS 2 P 2 -, NiS 2 PN-und NiS 2 PC-Chromophoren Inhaltsübersicht. Es wird über die Synthese, die spektroskopische und cyclovoltammetrische Charakterisierung von [Ni(dedtc)-(4-MP) 2 ](ClO 4 ) (1), [Ni(dedtc)(4-MP)(NCS)] (2), [Ni(dedtc)(PPh 3 )-(NCS)] (3) und [Ni(dedtc)(PPh 3 )(CN)] (4) (dedtc ϭ diethyldithiocarbamat, 4-MP ϭ Tri(4-methylphenyl)phosphin, PPh 3 ϭ Triphenylphosphin) berichtet. Die IR-Spektren der Komplexe 1-4 zeigen die charakteristische Thioharnstoff-(CN)-Bande bei größeren Wellenzahlen verglichen mit dem homoleptischen Dithiocarbamat-Komplex [Ni(dedtc) 2 ]. Die d-d-Übergänge werden im Bereich von ‡ Present address: 187The CV studies clearly show the presence of reduced electron density on the nickel ions in mixed ligand complexes 1-4 compared to the parent dithiocarbamate. Single crystal X-ray structure studies show all the complexes to containplanar NiS 2 P 2 , NiS 2 PN, and NiS 2 PC chromophores in keeping with the observed diamagnetism. In all the complexes the Ni-S distances are asymmetric. The thioureide C-N distance of the complexes 1-4 are less thanthe C-N distance observed in the parent [Ni(dedtc) 2 ]. 452-482 nm beobachtet. Die CV-Untersuchungen zeigen eine deutlich reduzierte Elektronendichte der Nickelionen in den Gemischtligand-Komplexen 1-4 im Vergleich zu [Ni(dedtc) 2 ]. Nach den Einkristallstrukturanalysen enthalten alle Komplexe planare NiS 2 P 2 -, NiS 2 PN-und NiS 2 PC-Chromophore, entsprechend ihrem Diamagnetismus. In allen Komplexen sind die NiϪS-Bindungen asymmetrisch. Die ThioharnstoffϪCN-Abstände sind in 1-4 kürzer als im Ausgangskomplex [Ni(dedtc) 2 ]. 1 H and 31 P nmr chemical shifts are listed to ± 0.01 ppm accuracy and the 13 C nmr chemical shifts to ± 0.1 ppm accuracy
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