A Novel Copper(II)–Hydrogen Oxalate Coordination Polymer Showing a New Coordination Mode

Crystal structure and spectroscopic properties of ammonium hydrogensquarate squaric acid monohydrate

“…3.1) is characterized by an underlying complicated IR-spectroscopic pattern like other squaric acid derivatives [7][8][9][10][11][12][13][14]. However in this case the presence of the ammonium cation and H 2 O molecules, both possessing series of stretching and bending characteristic IR-bands, leads to strong overlapping of the bands especially in the 3,500-2,800 cm @1 region.…”

“…As established in series of systematic crystallographic studies on the self-assembly of squarates and hydrogensquarates [1][2][3][4][5][6]. Detailed studied on the correlation of vibrational spectroscopic properties and structural motifs in squaric acid derivatives have been reported [7][8][9][10][11][12][13][14].…”

A Novel Copper Oxalate, Na2Cu(C2O4)2

“…Figure displays the typical representatives reported so far, namely the title compound Na 2 Cu(C 2 O 4 ) 2 , Na 2 Cu(C 2 O 4 ) 2 · 2H 2 O, K 2 Cu(C 2 O 4 ) 2 , and K 2 Cu(C 2 O 4 ) 2 · 2H 2 O. The [Cu(C 2 O 4 ) 2 ] 2– units in K 2 Cu(C 2 O 4 ) 2 · 4H 2 O arrange in the same way as in Na 2 Cu(C 2 O 4 ) 2 · 2H 2 O, and those in Cu(HC 2 O 4 ) 2 · 3H 2 O and Rb 2 Cu(C 2 O 4 ) 2 · 2H 2 O the same as in K 2 Cu(C 2 O 4 ) 2 · 2H 2 O, thus not displayed in Figure . Cs 2 Cu(C 2 O 4 ) 2 · 2H 2 O no longer retains [Cu(C 2 O 4 ) 2 ] 2– building units due to extraordinarily large Cs + cation, thus also not taken into consideration.…”

“…[14][15][16][17][18][19] It is worth to point out that the stacking pattern of [Cu(C 2 O 4 ) 2 ] 2units in this compound is quite different from the known copper oxalates. Figure 3 displays [20] and Rb 2 Cu(C 2 O 4 ) 2 ·2H 2 O [21] the same as in K 2 Cu(C 2 O 4 ) 2 ·2H 2 O, thus not displayed in Figure 3. Cs 2 Cu(C 2 O 4 ) 2 ·2H 2 O [22] no longer retains [Cu(C 2 O 4 ) 2 ] 2building units due to extraordinarily large Cs + cation, thus also not taken into consideration.…”

Synthesis and Spectroscopic Characterization of Some New Hydrogenoxalato Organotin (Iv) Complexes

“…Several papers on oxalato and hydrogenoxalato complexes have been reported [1][2][3][4][5][6], while only few hydrogenoxalato tin ones are known [7]. In this work we have synthesized four new hydrogenoxalato derivatives and adducts containing SnRn (R = Me, Ph and n = 2, 3) residues using the H3N(CH2)2NH3(HC2O4)2 .…”