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Green Chemistry with Supercritical CO2 and Enzymes

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Green Chemistry with Supercritical CO2 and Enzymes ( green-chemistry-with-supercritical-co2-and-enzymes )

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Materials 2021, 14, 1786 resulted in a CP crystallized in a monoclinic system with the crystal structure solved in the space group P21/c, TbCP3. The introduction of the phen in the crystalline structure also led to a decrease in the dimensionality of the CP, relatively to TbCP2, as previously reported in related CPs [12]. The asu of the crystal structure of TbCP3 comprises a Tb3+ center, a fully deprotonated aip2− ligand, a mono-protonated Haip− ligand, a phen mole- cule and one water molecule (uncoordinated), unequivocally confirming the formula of the 1D coordination compound as {[Tb(Haip)(aip)(phen)]⋅H2O}n (Figure 5 and Figure S5 space group P2 /c, TbCP3. The introduc3t+ion of the phen in the crystalline structure also led 1 identical coordination number of the Tb center (eight) in TbCP1, and the same CP di- to a decrease in the dimensionality of the CP, relatively to TbCP2, as previously reported mensionality (1D). Most probably, these similarities can be related with the identical syn- in related CPs [12]. The asu of the crystal structure of TbCP3 comprises a Tb3+ center, thesis conditions, despite the utilization of the additional co-ligand phen. a fully deprotonated aip2− ligand, a mono-protonated Haip− ligand, a phen molecule The Tb3+ center coordinates to six carboxylate O-atoms from three aip2− ligands (two and one water molecule (uncoordinated), unequivocally confirming the formula of the 1D unidentate and one bidentate chelating coordination modes) and from two Haip− ligands coordination compound as {[Tb(Haip)(aip)(phen)]·H2O}n (Figure 5 and Figure S5 in the (two unidentate modes). The metal coordination sphere is completed by two N-atoms Supplementary Material). Looking at TbCP2 and TbCP3 formulas, it can be verified the from the phen ligand, leading to an eight-coordinated center {TbO6N2} showing a dis- exchange of the two coordinated H2O molecules in TbCP2 for a phen molecule in TbCP3. torted dodecahedral geometry (Figure 5b). The Tb–O bond lengths range from 2.277(4) to 11 of 20 in the Supplementary Material). Looking at TbCP2 and TbCP3 formulas, it can be verified The attempt to further decrease the CP water content by using the co-ligand phen the exchange of the two coordinated H2O molecules in TbCP2 for a phen molecule in resulted in a CP crystallized in a monoclinic system with the crystal structure solved in the TbCP3. Interestingly, despite the introduction of the phen ligand, the TbCP3 revealed the Interestingly, despite the introduction of the phen ligand, the TbCP3 revealed the identical 2.453(4) Å, while Tb–N distances are considerably longer, 2.563(5) and 2.598(5) Å. The coordination number of the Tb3+ center (eight) in TbCP1, and the same CP dimensionality O(N)–Tb–O(N) angles are found between 63.51(16)° and 147.31(13)° (for additional details (1D). Most probably, these similarities can be related with the identical synthesis conditions, about these bond lengths and angles, please consult the Supplementary Material, Table despite the utilization of the additional co-ligand phen. S4). FiFgiugruere5. (5a.) Com(ap)letCeoTmbp1lceoteordTinb1atiocnoocrednitneartinontheccernytsetral isntrutchtuerecoryfsTtablCPs3tr,ucture of TbCP3, {[Tb(Haip)(aip)(phen)]·H2O}n, showing the labelling scheme for all the atoms of the first coordina- {[Tb(Haip)(aip)(phen)]·H2O}n, showing the labelling scheme for all the atoms of the first coordination tion sphere (atoms of the asu are drawn in the ball-and-stick model and those generated by sym- sphere (atoms of the asu are drawn in the ball-and-stick model and those generated by symmetry metry are shown in the stick model. H-atoms bonded to carbons were omitted for clarity). (b) Pol- are shown in the stick model. H-atoms bonded to carbons were omitted for clarity). (b) Polyhedral yhedral representation of the Tb3+ coordination geometry center. Symmetry transformations used representation of the Tb3+ coordination geometry center. Symmetry transformations used to generate to generate equivalent atoms: (i) −x,−y+1,−z+1; (ii) −x+1, −y+1 −z+1; (iii) x+1, y, z. equivalent atoms: (i) −x,−y+1,−z+1; (ii) −x+1, −y+1 −z+1; (iii) x+1, y, z. The Tb3+ center coordinates to six carboxylate O-atoms from three aip2− ligands (two unidentate and one bidentate chelating coordination modes) and from two Haip− ligands (two unidentate modes). The metal coordination sphere is completed by two N-atoms from the phen ligand, leading to an eight-coordinated center {TbO6N2} showing a distorted dodecahedral geometry (Figure 5b). The Tb–O bond lengths range from 2.277(4) to 2.453(4) Å, while Tb–N distances are considerably longer, 2.563(5) and 2.598(5) Å. The O(N)–Tb–O(N) angles are found between 63.51(16)◦ and 147.31(13)◦ (for additional details about these bond lengths and angles, please consult the Supplementary Material, Table S4).

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