Four
bis-benzimidazolium salts, 1,4-bis[1′-(
N
-R-benzimidazoliumyl)methyl]-2,3,5,6-tetramethylbenzene
2X
–
(
L
1
H
2
·(PF
6
)
2
: R = ethyl,
X = PF
6
;
L
2
H
2
·Br
2
: R = picolyl,
X = Br;
L
3
H
2
·Br
2
: R = benzyl, X = Br; and
L
4
H
2
·Br
2
: R = allyl, X = Br), and their three
N
-heterocyclic carbene (NHC) Pd(II) and Ag(I) complexes,
L
1
Pd
2
Cl
4
(
1
),
L
2
Ag
2
Br
2
(
2
),
and
L
4
(AgBr)
2
(
3
), as well as one anionic complex
L
3
H
2
·(Ag
4
Br
8
)
0.5
(
4
), have been synthesized and characterized. Complex
1
adopts a funnel-like type of structure, complex
2
adopts a cyclic structure, and complex
3
is an open
structure. In the crystal packing of
1
–
4
, one-dimensional polymeric chains and two-dimensional supramolecular
layers are formed via intermolecular weak interactions, including
hydrogen bonds, π–π interactions, and C–H···π
contacts. The catalytic activities of NHC Pd(II) complex
1
in three types of C–C coupling reactions (Suzuki–Miyaura,
Heck–Mizoroki, and Sonogashira reactions) were studied. The
results show that this catalytic system is efficient for these C–C
coupling reactions.
NHC Ag(i) and Hg(ii) complexes were prepared and characterized, and the catalytic activities of the NHC Pd(ii) complex in the Suzuki–Miyaura reaction were investigated.
A novel anthracene-based tetra-perimidine hexafluorophosphate, 9,10-di{bi[2’-(N-ethylperimidinyl)ethyl]aminomethyl}anthracene PF6- (3) was prepared, and its structure was determined through X-ray analysis, 1H and 13C NMR. There are two soft (N-ethylperimidinylCH2CH2)2NCH2- moities on 9,10-locations of anthracene in the cationic part of 3. Compound 3 was used as a chemosensor to research the recognition ability for Cr3+ by fluorescence and UV titrations, IR, 1H NMR and HRMS. The results indicate that 3 is an effective chemosensor for Cr3+.
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