Coordination Behavior of 3-Ethoxycarbonyltetronic Acid towards Cu(II) and Co(II) Metal Ions

<table>X-band spectrum of compounds <svg height="13.075" id="M117" style="vertical-align:-1.76814pt" version="1.1" viewbox="0 0 22.262501 13.075" width="22.262501" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,13.075)">
<g transform="translate(72,-61.54)">
<text transform="matrix(1,0,0,-1,-71.95,63.35)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝟏</tspan>
<tspan style="font-size: 12.50px; " x="6.2515001" y="0">,</tspan>
<tspan style="font-size: 12.50px; " x="11.452748" y="0">𝟐</tspan>
</text>
</g>
</g>
</svg>,
and <svg height="11.1" id="M118" style="vertical-align:-0.17555pt" version="1.1" viewbox="0 0 7.9375 11.1" width="7.9375" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,11.1)">
<g transform="translate(72,-63.12)">
<text transform="matrix(1,0,0,-1,-71.95,63.35)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝟑</tspan>
</text>
</g>
</g>
</svg>. EPR conditions: microwave
frequency 9.407 GHz, temperature 4.2 K, mod. ampl. 8 Gpp, microwave power 8.2 mW,
sweep time 200 seconds, t.c.: 300 milliseconds.  The asterisks
(<i>∗</i>) indicate unique peaks characteristic for compound <svg height="10.875" id="M119" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 7.9375 10.875" width="7.9375" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.875)">
<g transform="translate(72,-63.3)">
<text transform="matrix(1,0,0,-1,-71.95,63.35)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝟏</tspan>
</text>
</g>
</g>
</svg>.</table>

Bioinorganic Chemistry and Applications

fig1

Figure 1

Figure 1: Coordination Behavior of 3-Ethoxycarbonyltetronic Acid towards Cu(II) and Co(II) Metal Ions 