Synthesis, characterization and anti‐microbial studies of cadmium(II) compounds containing 3,10‐C‐meso‐Me₈[14]ane_C. Crystal and molecular structure of cis‐[CdL_C(NO₃)](NO₃)

Abstract

− ligand is replaced by two monodentate ligands that occupy axial positions. All compounds were characterized on the basis of analytical, spectroscopic, conductometric and magnetochemical data. The crystal structure of cis-CdL C (NO 3 )](NO 3 ) was determined by X-ray crystallography and showed the cadmium centre to exist within a cis-N 4 O 2 donor set that defined a distorted octahedral geometry. Non-systematic variations in the Cd-O and Cd-N bond distances were correlated with significant hydrogen bonding interactions operating in the crystal structure. The latter interactions led to the formation of supramolecular two-dimensional arrays. The anti-fungal and anti-bacterial activities of these compounds were studied against some phytopathogenic fungi and bacteria. Coordination of L C by cadmium resulted in more effective anti-microbial agents; no significant dependence upon the nature of the counter-ion was detected. Copyright

Synthesis and Selected Properties of New Complex Cation Decorated Polyoxotantalates

“…The latter value is longer than the sum of ionic radii (Cd 2+ CN7 : 1.03 Å; O 2– : 1.35 Å). Similar values were reported for CdN 4 O 3 in the CTP environment, and as expected, the Cd–O bond to the capping O 2– is longer than to O 2– anions in the trigonal prism. − The Cd–N bonds are between 2.196 and 2.485 Å (Table S8), in agreement with literature values. − The N–Cd–N and O–Cd–O cis angles range from 74.4(4)° to 97.9(4)°, respectively, from 62.96(14)° to 65.78(14)°, and the N–Cd−μ 2 -O angles are 74.2(3)–96.8(3)°. The trans angles cover a wide range as expected by different orientations of the monocapped trigonal prisms (Table S9), but the geometric parameters are not unusual and similar data were reported in the literature. ,, …”

Cadmium(II) compounds of the bis-cyanoethyl derivative (LCX) of Me8[14]aneC (LC): characterization and antibacterial studies

“…Relevant to the present study are recent reports describing the antibacterial activities of cadmium compounds [11,12,13,14]. These follow earlier studies, whereby cadmium(II) macrocyclic compounds were reported to exhibit potent antibacterial potential [13,14]. In addition, we have also reported x-ray crystallographic studies of cadmium(II) compounds with other macrocycles [14,15].…”

“…Due to the multifarious applications [1,2,3,4,5,6,7,8,9,10] of macrocyclic ligands, including differential behavior exhibited by their isomeric forms and their metal complexes in a wide variety of contexts, researchers continue to be fascinated by their chemistry and various applications, including in the development of metal-based drugs and as imaging agents. Relevant to the present study are recent reports describing the antibacterial activities of cadmium compounds [11,12,13,14]. These follow earlier studies, whereby cadmium(II) macrocyclic compounds were reported to exhibit potent antibacterial potential [13,14].…”

“…These follow earlier studies, whereby cadmium(II) macrocyclic compounds were reported to exhibit potent antibacterial potential [13,14]. In addition, we have also reported x-ray crystallographic studies of cadmium(II) compounds with other macrocycles [14,15]. Though copper(II), nickel(II), and cobalt(III), and chromium(III) complexes of macrocyclic ligands described herein have been reported [16,17], related studies on cadmium(II) have yet to be reported.…”

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The isomeric ligand L C , a saturated analogue of 2,9-C-meso-Me 8 [14]diene, on reflux with excess acrylonitrile afforded 1,8-N-pendant cyanoethyl derivative L CX . Interaction of L CX with cadmium(II) perchlorate, nitrate, acetate, and chloride salts produced six coordinated octahedral compounds,, and [Cd(L CX )Cl 2 ], respectively.

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