Jan van Leusen’s research while affiliated with RWTH Aachen University and other places

... UV-vis spectra show several bands/shoulders at <350 nm, attributed to the intra-ligand n!p � /p!p � (LL), and at 350-450 nm, assigned to the metal-ligand charge transfer (MLCT) transitions ( Figure S2). A weak broad band is detected at 500-900 nm, resulting from combinations of several d-d electrons transitions of metal(II) ion, a typical band for the d 8 Ni(II) ( Figure S2) [39]. ...

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Synthesis and characterization of novel {N'-(fluoro/ chloro/nitro)benzylidene}-3-(decyloxy)benzoylhydrazide nickel(II) complexes and mesogenic property

... Besides, dca anion has been employed in constructing molecular magnetic materials due to its fantastic ability to convey magnetic interactions [6]. Comparing to the cyanide anion, the weak ligand field enable dca to stabilize the high spin states of metal ions [7], leading to magnetic order observed in some dicyanamidometallates [8]. In addition, dicyanamide anion can coordinate to a metal ion in a monodentate, bidentate, even as a tridentate manner, because of its two nitrile and one amido nitrogen atoms, and thus resulting in various structures [9]. ...

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Structure and magnetism of a chiral Perovskite-like dicyanamidometallate framework

... [7][8][9][10][11] Furthermore, some of them were used as organic components to build zinc, cobalt, cadium, and copper, etc. complexes [12][13][14][15][16][17] and polyoxometalates, including polyoxovandates, 18 polyoxomolybdates, 19,20 and polyoxotungstates. 21,22 A convenient way to modify 2-amino group is through Schiff base reaction because there are a large number of aromatic aldehydes to choose. In 2015, Percino and co-workers reported the synthesis and crystal structures reacting 2-amonophenylarsonic acid with equimolar salicylaldehyde in ethanol solution in the presence of HCl as a catalyst. ...

Reference:

The crystal structure of (E)-(2-(2-hydroxy-3-methoxybenzylidene)aminophenyl)arsonic acid, C14H14AsNO5

... 43 Moreover, the greater antimicrobial behavior of the copolymer resulted from the grafted cyanoguanidine moieties, which act as potent chelating centers for suppression of spore elements and binding to essential nutrients for microbial growth. 44,45 This explains the better antibacterial effect of the copolymer, compared to the virgin CMCS. Analogous findings were reported for the antimicrobial activity of chitosan, CMCS, and their hydrogels. ...

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EVALUATION OF IN-VITRO ANTIMICROBIAL ANTIOXIDANT AND ANTICANCER ACTIVITY OF A NEW CARBOXYMETHYLCHITOSAN-BASED CYANOGUANIDINE COPOLYMER

... 40,41,[58][59][60] Furthermore, while the selective formation of co-crystals directed by specific noncovalent interactions between co-formers is widely recognized, similar phenomena based on specific shape and/or size complementarity of building units, are rarely explored. 61 Based on our longstanding experience in the design and development of synthetic approaches for main-group and transition metal multinuclear clusters [62][63][64][65][66][67][68][69] as well as the studies on the noncovalent interactions-driven self-assembly of metal complexes, 63,64,68,[70][71][72][73][74] herein, we present the synthesis and comprehensive structural characterization of two new heteroleptic hydroxido-acetato and acetato Co(II) clusters [Co 6 (OH) 2 (OAc) 4 (pyret) 6 ] (1) and [Co 6 (OAc) 6 (pyret) 6 ] (2) incorporating an auxiliary 2-pyrrolidinoethoxylate (pyret) ligand. Remarkably, the proper purification of a starting Co(II) acetate reagent played a pivotal role in the selective formation of clusters 1 or 2. Comprehensive structural analysis of new compounds demonstrated intriguing crystal structure diversity of hydroxido-acetato cluster 1, which represents a rare example of both conformational and packing polymorphism in one compound. ...

Reference:

Synthesis, polymorphism, and shape complementarity-induced co-crystallization of hexanuclear Co(II) clusters capped by a flexible heteroligand shell

... Over the last two decades, a large number of cyanoguanidine coordination compounds have been reported, such as Zn(C2N4H4)2Cl2 [1][2][3], [Ag(C2N4H4)2]F, [Ag(C2N4H4)2](BF4) [4], Cu(C2N4H4)2Br2·2H2O [5] and others [6][7][8][9]. As a nitrogenous ligand, cyanoguanidine was discovered by Beilstein and Geuther at the end of the 19th century [10], and since then it has attracted widespread attention because of its interesting structure and important role in medicinal and industrial applications [11][12][13]. ...

Reference:

Solvent-Induced Cobalt(II) Cyanoguanidine Bromides: Syntheses, Crystal Structure, Optical and Magnetic Properties

... [42][43][44][45] This mainly benefits from their macrocyclic structures and easily modified upper and lower edges. [46][47][48][49][50][51][52][53] Along this line, a novel Cu(II)-resorcin [4]arene-based complex, namely, [Cu 3 Cl 6 (TPTR4A)(DMA)] · CH 3 CH 2 OH (Cu-T), was firstly synthesized via the self-assembly of the known multidentate resorcin [4]arene-based ligand (TPTR4A) and copper ions. However, the stability of the compound Cu-T was far less than that of the reported compounds [Cu 4 (TPTR4A) 2 ][PW 12 O 40 ] · 2.5DMA (Cu-SiW). ...

Reference:

Polyoxometalate‐Incorporated Cu‐Resorcin[4]arene Metal‐Organic Complexes as Heterogeneous Catalysts for Catalytic Oxidation of Mustard Gas Simulant

... The role of ions of s-elements in the design of heterometallic systems with 3d-metal ions may involve not only the organization of a layered or a framework polymeric structure due to the binding of organometallic anionic fragments [6,7] but also due to the template function during the formation of the {Li-3d} polynuclear metal core [8,9]. The Li + ion, whose radius (0.68 Å) is close to that of doubly and triply charged 3d-metal ions (from 0.64 Å for Cr 3+ and Fe 3+ to 0.91 Å for Mn 2+ ) [10], forms Li-3d molecular complexes with O-donor ligands due to Li-O intramolecular ionic bonds [11][12][13][14][15][16], but the number of described Li-3d coordination polymers is also very large [17][18][19][20][21]. ...

Reference:

Crystallization Features of LiI-CrIII Coordination Compounds with Cyclobutane-1,1-Dicarboxylic Acid Anions

... In the connection with tellurides containing p-block elements, a lot of attention has been paid to characterize the nature of multicenter bonds violating the straightforward (8-N) rule [45][46][47][48][49][50]. Furthermore, the Zintl-Klemm-Busmann procedure is not quite helpful to identify the correlations between structural fragments and bonding scenarios in tellurides containing transition metals, either [51][52][53][54][55][56][57][58]. ...

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Exploring the correlation between chemical bonding and structural distortions in TbCu0.33Te2

... Kogerler and co-workers, reported the synthesis and structural characterisation of a series of homoleptic doubledecker complexes [Ln III (L 36 ) 2 ](OTf) 3 (33a, Ln=Y III ; 33b, Ln = Tb III ; 33c, Ln = Dy III ), tetrakis-O-(diethoxyphosphoryl)-ptertbutylcalix [4]arene (L 36 ), OTf = trifluoromethanesulfonate). [80] These compounds contain a modified calixarene unit where the four coordinating oxygen atoms are coplanar which results in a square-antiprismatic geometry around the metal ion ( Figure 35). ...

Reference:

Lanthanide Phosphonates and Phosphates in Molecular Magnetism