求翻译化学类文献~高分

求翻译化学类文献~高分
The charge-neutral organoplatinum(II) complexes herein,
namely [4-R1-(N^C^N)PtC\3CC6H4-4’-R2] (1–8, N^CH^N=
1,5-bis(2’-pyridyl)benzene), were prepared in quantitative
yields by stirring the corresponding precursor, [4-R1-
(N^C^N)PtCl] (R1=CF3,[10g] H,[13a] or CH3
[13b]), and an
excess of aryl acetylene in methanol in the presence of
NaOH for one day at room temperature.[14] It is notable that
when R1 is CF3, the solids of complexes 1–6 display various
colors, depending on the substituent R2 on the aryl acetylide
ligand (Scheme 1). When R2 is an electron-withdrawing group
(CF3 for 5 and NO2 for 6), an electron-donating group (OCH3
for 3 and N(CH3)2 for 4), or a relatively neutral group (H for 1
and F for 2), the solid is bright yellow, deep red, or dark green
in color, respectively. When R1 is H or CH3, no such color
contrast was observed upon varying R2 from electron-withdrawing
to -donating groups; the solids are yellow in color, as
depicted for complexes 7 and 8 in Scheme 1.
Colors of organoplatinum(II) complexes in the solid state
are usually associated with intermetal interactions.[15] Various
packing modes have been identified by X-ray crystallography
for crystals of complexes 1 (Figure 1), 4 (Figure S1 in the
Supporting Information), and 7 (Figure S2 in the Supporting
Information), which appear as green, red, and yellow solids,
respectively.[16] The salient features in the crystal structures of
both 1 and 4 are the intermolecular PtII···PtII/p–p and
C\2H···p(C\3C) interactions in an orthogonal configuration.