Structural diversity of 5-methylnicotinate coordination assemblies regulated by metal-ligating tendency and metal-dependent anion effect

Twelve Cadmium(II) Coordination Frameworks with Asymmetric Pyridinyl Triazole Carboxylate: Syntheses, Structures, and Fluorescence Properties

“…Anions can coordinate to the metal center in monodentate fashion as well as in a bridging mode, and the bridging ability of the anion has a drastic effect on the dimensionality of the coordination polymers and often leads to varieties of intriguing architectures. Additionally, during the assembly process, anions not only act as the guests and/or counterion to template the construction of host frameworks, but also act as the hydrogen-bonded donor or acceptor to extend the molecular units into high-dimensional networks. − Anions, therefore, can be selectively used to increase or reduce the dimensionality of the resulting polymeric network. Although considerable progress has been achieved concerning the role of anions in self-assembly processes, ,− the influence of anions on the self-assembly processes is still less well understood and systematic investigations remain scarce.…”

“…The unusual structures, topologies, roles of anions, and photoluminescence properties are described and discussed in detail. To the best of our knowledge, this paper presents the largest number of inorganic anions that have been involved in coordination in all the reported literature, − which offers an opportunity for us to discuss the roles of anions.…”

Role of Anions in the Formation of Multidimensional Coordination Polymers: Selective Separation of Anionic Toxic Dyes by 3D-Cationic Framework and Luminescent Properties

“…In recent times, the design and synthesis of metal–organic frameworks (MOFs) or coordination polymers (CPs) have been paid much attention due to their potential applications such as gas storage, , guest inclusion, , separation, , and luminescent − properties. Crystal engineering of CPs involves the design of molecular building blocks which self-assemble via coordination bonds to construct higher dimensional networks. − The combination of coordination bonds and hydrogen bonds in designing the CPs has been explored in order to increase the dimensionalities of the networks. , In the design of network materials, the self-assembly process of metal and organic ligand plays a pivotal role to produce structure dependent functional materials. − Such a self-assembly process not only depends on the coordination abilities of ligand and metal atom but also largely depends on anions which acts as templates and also on reaction conditions such as the solvents, presence of guest molecules, concentrations, and temperatures. − Although the inorganic anions such as NO 3 – , ClO 4 – , SiF 6 2– , and SO 4 2– generally do not take part in the formation of coordination networks, they profoundly influence the M–L network geometries such that there is a better fit for those anions within the network cavities and channels. − The hydrogen bonding ability, shape, and size of the anions are some of the important factors by which the networks/geometries and their packing are being influenced. , …”

Solvent-mediated structural transformations of copper(II) coordination polymers induced by different short-chain alcohols

“…This is possibly due to the weak connecting ability of the shortchain alcohol, as well as the different geometry configuration. Recently, 5-substituted nicotinic acid has been proved a promising building tecton to construct CPs (Li et al, 2014(Li et al, , 2015b, some of which show dynamic characteristics (Ming & Bai, 2017;Li, Li et al, 2017). Herein, we will present a copper(II) CP, {Cu(L-F)(N 3 )} n (1), HL-F = 5-fluoronicotinic acid), which shows various transformations by immersing in different short-chain alcohols (CH 3 OH, C 2 H 5 OH or HOC 2 H 4 OH) (see Scheme 1).…”