[1,9-Bis(diphenylphosphino)-3,7-dithianonane]monobromonickel(II) tetraphenylborate, C31H34BrNiP2S2+.C24H20B−, at 295K, and [1,9-bis(diphenylphosphino)-3,7-dithianonane]monoiodonickel(II) tetraphenylborate, C31H34INiP2S2+.C24H20B−, at 120K

Synthesis, Characterization, and Reactivity toward Nickel(II) of the New Saturated 14-Membered P2S2 Macrocycles cis- and trans-1,8-Diphenyl-1,8-diphospha-4,12-dithia- cyclotetradecane

“…The P−Ni−P angle is almost linear (174.1(1)°) but equatorial angles vary from 109.1(3) to 137.4(1)°. The Ni−P and Ni−S bond distances are similar, ranging from 2.181(3) to 2.193(3) Å, and are in agreement with the values found in the literature for pentacoordinated or square-planar 2d,, Ni(II) complexes in related P 2 S 2 environments. The simultaneous coordination of the four macrocyclic donor atoms to the Ni(II) atom defines two five-membered and two six-membered chelate rings in half-chair and chair conformations, respectively.…”

Variable modes of nickel(II) coordination with macrocyclic ligands based on 1,5-bis(2-mercaptoethyl)-1,5-diazacyclooctane (BME-DACO)

“…In fact, the pentacoordinate, distorted squarepyramidal form of (DACODA)(S03)Com in the solid state and in solution gives UV-vis spectra typical of octahedral Co111 complexes.7 As discussed by Legg et al7 and indicated by structure A (Chart III), an agostic C-H interaction (Co-H = 2. 31 (5) Á) from the boat form of the metalladiazacyclohexane ring is effectively the sixth "ligand". Therefore, the possibility exists that the two-band pattern in the UV-vis spectrum of 3a might reflect pseudooctahedral geometry with one bound bromide and an agostic C-H perturbing the site trans to Br, structure B (Chart III).…”