ChemDraw User's Manual - CambridgeSoft

Administratoris not recognized by ChemDraw, and generates anerror message if you try to analyze it. Generally,empirical formulas (C 2 H 6 and H 2 SO 4 ) are notrecognized, but structural formulas (CH 3 CH 3 andHOSO 2 OH) are.Molecular weight and elemental analyses ofempirical structures is possible, but the ExpandLabel command does not work with them.Empirical structures are discarded when they aretransferred to other applications that requireunambiguous structures.Chemically-significant text must be entirely inFormula or, for isotopes and charges, Superscriptstyle. ChemDraw does not recognize a chemicalformula embedded within a larger block of text.NH 4 +If you draw a bond, add an atomlabel, and then delete the bond,you have a chemicallymeaningful text block whosefont, size, and style match otheratom labels.If you create a caption with thetext tool and set it to Formulastyle, you have a chemicallymeaningful text block whosefont, size, and style match othercaptions.+NH 3(N+)H 3NH 3 +(N+)H 3CO 2 -CO(O-)NH 3+Fe++Fe +2Fe 2+A charge that does not followan element is assigned to thenext element.Charges that follow amonovalent element with arepeat count are assigned to theelement before that element.Charges that follow otherrepeating units are distributedamong those units.Charges may be superscripted.Multiple charges arerecognized appropriately.Charges may have repeatcounts as long as both thecharge and the repeat count aresuperscripted.A “floating” charge placed withthe Chemical Symbols Tool isassigned to the nearest atom. Ifno atom is within the distanceset as the Fixed Length, thecharge is ignored and notassigned to any atom.A “floating” charge placedwithin a delocalized system isrecognized by the AnalyzeStructure function, but isdiscarded when saved toformats that require all chargesto be associated with specificatoms.H 2 OChargesCharges may be created as part of a textual atomlabel or with the appropriate symbol from theChemical Symbols Palette. Charges are alwaysassigned to a specific element in the atom label,whose acceptable valences become those of thesimilar isoelectronic neutral element.O-A charge following an elementis assigned to that element.NH 3(N+)H 3234•The Chemistry of ChemDrawCambridgeSoftChemical Conventions