Gargi Mukherjee

Post-synthetic modification of isomorphic coordination layers: exchange dynamics of metal ions in a single crystal to single crystal fashion

A diverse set of guest molecules template the consistent formation of fifteen iso-structural layered structures containing a pyridine based tripodal ligand, divalent metal ions and anions. These materials have shown a remarkable ability to interconvert from Zn(II) to Cu(II), Cd(II) to Cu(II), Cu(II) to Cd(II) complexes in a SCSC (single crystal-to-single crystal) fashion.

Evolutionary operation-factorial design technique for optimization of conversion of mixed agroproducts into gallic acid

This article presents the optimization of gallic acid production using filamentous fungi from tannin-rich mixed substrates taking into account the interaction effects of six variable process parameters. The methodology adopted for optimization was the evolutionary operation (EVOP)-factorial design technique. This technique combines the factorial method for designing experiments with the EVOP methodology for analyzing the experimental results systematically and arriving at conclusions according to its decision-making procedure. Standard deviation and error limits based on 95% confidence were calculated according to the relationship given in the literature. It was found that the best combinations of the process parameters at the optimum levels were 30°C, 80% relative humidity, pH 5.0, 48-h incubation period, 3 mL of induced inoculum, and 35 g of mixed substrate, resulting in a gallic acid yield of 94.8% under modified solid-state fermentation.

1D, 2D and 3D coordination polymers of 1,3-phenylene diisonicotinate with Cu(I)/Cu(II): Cu2I2 building block, anion influence and guest inclusions

The reactions of a flexible bidentate ligand 1,3-phenylene diisonicotinate (L) with Cu(I/II) salts afforded coordination polymers with varied dimensionalities and guest inclusion capabilities. Complexation of L with CuI resulted in a 2D-network with (4,4) topology and inclusion of guest molecules such as CHCl3, bromobenzene, nitrobenzene and benzonitrile. The treatment of L with Cu(PF6)2 and Cu(ClO4)2 resulted in a one-dimensional network containing M2L2 macrocycles and a 4-fold interpenetrated three dimensional network having quartz topology, respectively. The 1D-networks included CHCl3 as guests and the interpenetrated 3D-network includes tetrahedral water clusters.

3D, 2D and 1D networks via N-H⋯ O and N-H⋯ N hydrogen bonding by the bis-amide analogues: Effect of chain lengths and odd-even spacers

AbstractThe synthesis, crystal structures and hydrogen bonding networks of four members of the bis(pyridinecarboxamido)alkane and bis(pyridyl)alkanediamides series (1 ≤ n ≤ 8), where the amide moieties are separated by alkyl chain (-(CH2)n-) having even or odd number of -(CH2)-groups are explored and correlated with the previously reported structures. The odd members (n = odd) of both the series are found to adopt three-dimensional networks in contrast to the 1D or 2D structures of the even members (n = even). This odd-even effect on the dimensionality of the networks however disappears with increase in chain length. Graphical AbstractThe synthesis, crystal structures and hydrogen bonding networks of four members of the bis(pyridinecarboxamido)alkane and bis(pyridyl)alkanediamides series (1≤ n≤ 8), where the amide moieties are separated by alkyl chain (-(CH2)n-) having even or odd number of -(CH2)-groups are explored and the effect of chain length on the odd-even alteration of network pattern is investigated.