A new flexible ligand,
bis(cyanobenzyl)bipiperidine (L), has been synthesized
and structurally characterized. Nine novel
silver(I) coordination polymers (CPs), the dimensionality of which
depends on the counteranion, [Ag2(L)(NO3)2]
n
(1), [Ag2(L)(NO3)2]
n
(2), {[Ag2(L)(NO3)2)](C16H10)}
n
(3), {[Ag2(L)(NO3)2)](C20H12)}
n
(4), [Ag2(L)(ClO4)2]
n
(5), [Ag2(L)(CF3SO3)2(C4H8O)2]
n
(6), [Ag2(L)(CF3SO3)2(C3H6O)2]
n
(7), {[Ag2(L)2]·(BF4)·2(C3H6O)}
n
(8), and [Ag2(L)3(PF6)2]·x(C3H6O) (9), have been prepared
by self-assembly of L with AgX (X = NO3
–, ClO4
–, CF3SO3
–, BF4
–, and PF6
–) and aromatic guest molecules.
Reactions of L with AgNO3 in acetone in either
1:2 or 1:1 stoichiometric ratio occurred rapidly at room temperature,
yielding topologically different structural isomers of the three-dimensional
(3D) CPs 1 and 2. Additional reactions of
linker L with AgNO3 in the presence of aromatic
guest molecules (pyrene, perylene) formed CPs of 3 and 4 with the inclusion of the corresponding guest in the crystal
lattice associated with the reduction of dimensionality of the self-assembled
product from 3D to two-dimensional (2D). Reaction of L with AgTf (Tf = CF3SO3
–)
in acetone and THF gave two structurally related 2D CPs (6 and 7). Compound 8 represents a one-dimensional
(1D) coordination polymer where the BF4 anions are not
linked to the silver nodes, while 9 is a discrete coordination
complex. Anion exchange accompanying an irreversible structural conversion
from 7 to 1 and 7 to 8 was monitored in the crystalline state by IR and PXRD techniques.
On the other hand, a reversible anion exchange process was observed
between 1 and 8. The electrochemical and
solid-state photoluminescence properties of these Ag(I) CPs were also
characterized.
Vinyl sulfones have been efficiently synthesized by treatment of alkenes with sodium arene sulfinates using potassium iodide and sodium periodate in the presence of a catalytic amount of acetic acid at room temperature. The products are formed in high yields (87-95%) within 2.5-8 hours.
Treatment of N-benzyloxycarbonylamino sulfones with triethyl phosphite catalyzed by InCl3 produces the corresponding protected alpha-amino phosphonates in high yields (71-92%).
S y n t h e s i s o f T e t r a s u b s t i t u t e d P y r r o l e sAbstract: The four-component coupling reaction of aldehydes, amines, dialkyl acetylenedicarboxylates, and nitromethane in the presence of molecular iodine as a catalyst furnished the corresponding 1,2,3,4-tetrasubstituted pyrroles under reflux. The products are formed in high yields (65-88%) within 8 hours. The method is simple, efficient, cost-effective, and metal-free.
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