Kristall-und Molekülstruktur des (Tetramethylcyclobutadien)cis-1.2-dicyano-ethen-1.2-dithiolato-nickel(II) /Crystal and Molecular Structure of (Tetramethylcyclobutadiene)cis-1,2-dicyano-ethene-1,2-dithiolato-nickel(II)

Abstract

<jats:title>Abstract</jats:title><jats:p>Single crystals of the title compound, A, have been prepared and studied structurally by X-ray analysis. A crystallizes in the space group P2<jats:sub>1</jats:sub>/n with Z = 4 and lattice parameters a = 11.174(3), b= 15.627(5), c= 8.148(3) Å and β = 92.82(3)°. Within the limits of error the π-bonded cyclobutadiene ring is a square with an average C-C-bond distance of 1.465 Å ; the methyl groups are displaced away from the nickel atom, the average distance between the ring plane and the methyl C-atoms being 0.15 Å. The sulfur containing five membered ring has a cyclic delocalized electron distribution.</jats:p>

Platinum Dithiolene Complexes of π-Coordinating and π-Interacting η4-Cyclobutadiene Ligands

“…Some nickel and palladium complexes of the η 4 -C 4 R 4 ligand have been reported as follows: [(η 4 -C 4 Me 4 )Ni(mnt)] (mnt = maleonitrile-1,2-dithiolate), , [(η 4 -C 4 Ph 4 )Pd(mnt)], and [(η 4 -C 4 (Me) 2 ( t Bu) 2 )Pd(bdt)] . However, the highly toxic [Ni(CO) 4 ] is required for the (η 4 -C 4 R 4 )Ni complexes, and the Pd complex requires an expensive asymmetric alkyne as a precursor .…”