Preparation, Crystal Structures, and Thermal Studies of Alkaline Earth Nitrocarboxylates

Abstract

The preparation, crystal structures, and thermal properties of [Ca(pyr) 2 (4-nba) 2 ] n (1) (pyr = pyrazole; 4-nba = 4-nitrobenzoate)The anhydrous Ca II compound 1 and the diaqua Ca II -3-nitrophthalate monohydrate 2 are one-dimensional coordination polymers containing a hexacoordinate Ca II ion located on a center of inversion in 1 and a heptacoordinated Ca II ion in 2. In 1, the 4-nitrobenzoate moiety acts as a μ 2 -bridging bidentate ligand,

Synthesis, characterization and photochemistry of a new heptamolybdate supported magnesium-aqua coordination complex

“…A search of the Cambridge database reveals several such compounds (table S2). A few examples containing less than six coordinated water molecules around Mg(II) are known 36. The presence of {(H 2 O) 5 Mg} unit in the complex dianion can be attributed to the structure directing effect of the organic cation via H-bonding interactions with the O atoms of heptamolybdate and the O atoms of coordinated water.…”

Coordination polymers of Na(I), Mg(II) and Co(II) ions based on biphenyl-4,4′-diacetic acid: Synthesis, crystal structures and thermal properties

“…Afterwards, the DSC curve in the temperature range 270-590°C displays three maxima at about 380, 410 and 570°C corresponding to decomposition and burning of the compound. Magnesium oxide (MgO), was formed at 590°C as the final product of thermal decomposition (calcd: 89.21%; found: 88.63%) [60,61].…”

Calcium complex of 2,5-dihydroxybenzoic acid (gentisic acid): synthesis, crystal structure, and spectroscopic properties

“…In the majority of cases, calcium complexes prepared in aqueous media contain up to four coordinated water molecules [4,10,12,18]. There are only a few calcium compounds with higher number of water molecules, for example: (ImH) 4 11 ]·5H 2 O (CMP = cytidine 5′-monophosphate) [22]. In the case of metal complexes with gentisic acid, some of them are described in the literature [23][24][25][26][27][28], but there are no papers concerning calcium gentisate.…”

“…There are many studies on structures and functions of alkaline earth complexes with amino- [8,9], nitro- [2,6,7,10], hydroxybenzoic [4,11], and benzoic [12] acids. strong metal-ligand bonding and weaker bonding forces such as hydrogen bonding and π-π interactions stabilize the structures of these compounds.…”