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Volumn 13, Issue 3, 2013, Pages 1206-1217

Four polymorphs of methyl paraben: Structural relationships and relative energy differences

Author keywords

[No Author keywords available]

Indexed keywords

AB-INITIO ELECTRONIC CALCULATIONS; CONFORMATIONAL ENERGIES; DIMETHYL TEREPHTHALATE; HYDROGEN-BONDED CHAINS; INDUCTION ENERGY; POLYMORPHIC FORMS; RELATIVE ENERGIES; STRUCTURAL RELATIONSHIP;

EID: 84876937915     PISSN: 15287483     EISSN: 15287505     Source Type: Journal    
DOI: 10.1021/cg301639r     Document Type: Article
Times cited : (43)

References (77)
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    • This is evidenced by an XPac comparison (dissimilarity index x = 0.-the transformation matrix [100.010.101] converts the unit cell of this structure model into that of CEBGOF01 (for details, see Supporting Information, Figure S5
    • This is evidenced by an XPac comparison (dissimilarity index x = 0.-the transformation matrix [100.010.101] converts the unit cell of this structure model into that of CEBGOF01 (for details, see Supporting Information, Figure S5
  • 13
    • 0010520441 scopus 로고    scopus 로고
    • Oxford Diffraction Ltd.: Abingdon, Oxford, England
    • CrysAlis CCD and CrysAlis RED; Oxford Diffraction Ltd.: Abingdon, Oxford, England, 2003.
    • (2003) CrysAlis CCD and CrysAlis RED
  • 14
    • 0004324616 scopus 로고    scopus 로고
    • Bruker AXS Inc.: Madison, WI
    • SMART, SAINT and SADABS; Bruker AXS Inc.: Madison, WI, 1997.
    • (1997) SMART SAINT and SADABS
  • 15
    • 47949105142 scopus 로고    scopus 로고
    • Bruker AXS Inc.; Madison, Wisconsin, USA
    • Sheldrick, G. M. SADABS, Version 2007/7; Bruker AXS Inc.; Madison, Wisconsin, USA, 2007.
    • (2007) SADABS Version 2007/7
    • Sheldrick, G.M.1
  • 52
    • 84876897930 scopus 로고    scopus 로고
    • The term "supramolecular construct" (SCdenotes the specific spatial geometry of a finite cluster (0Dor extended D, 2D, or 3Darrangement of molecules in a crystal structure.11 Thus, two crystals have an SC in common if they contain geometrically similar subcomponents, manifested by sets of matching internal coordinates. This term only implies geometrical closeness. By contrast, "supramolecular synthons" are defined as "structural units within supermolecules which can be formed and/or assembled by known or conceivable synthetic operations involving intermolecular interactions". 61 The O-H···O?C bonded supramolecular synthon generates a catemer which is found in all four polymorphs of methyl paraben. In this set, no common SCs are associated with this synthon as the spatial geometries of the resulting O-H···O?C bonded chains are all fundamentally different from each other (Figure 4
    • The term "supramolecular construct" (SCdenotes the specific spatial geometry of a finite cluster (0Dor extended D, 2D, or 3Darrangement of molecules in a crystal structure.11 Thus, two crystals have an SC in common if they contain geometrically similar subcomponents, manifested by sets of matching internal coordinates. This term only implies geometrical closeness. By contrast, "supramolecular synthons" are defined as "structural units within supermolecules which can be formed and/or assembled by known or conceivable synthetic operations involving intermolecular interactions". 61 The O-H···O?C bonded supramolecular synthon generates a catemer which is found in all four polymorphs of methyl paraben. In this set, no common SCs are associated with this synthon as the spatial geometries of the resulting O-H···O?C bonded chains are all fundamentally different from each other (Figure 4).
  • 72
  • 76
    • 84876910512 scopus 로고    scopus 로고
    • Differential scanning calorimetry experiments have shown an exothermic solid-solid transition from 1-III to 1-I (Supporting Information, Figure S14). It follows from the order of melting points and the exothermic transition on heating that the two polymorphs are monotropically related (heat of transition rule; see ref 66
    • Differential scanning calorimetry experiments have shown an exothermic solid-solid transition from 1-III to 1-I (Supporting Information, Figure S14). It follows from the order of melting points and the exothermic transition on heating that the two polymorphs are monotropically related (heat of transition rule; see ref 66).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.